Added more folders and restructured classes inside them.

pyproject.toml

@@ -1,3 +1,7 @@
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
 [project]
 name = "PTEU-Linux-Launcher"
 version = "0.9.11"
@@ -8,3 +12,27 @@ dependencies = []
 [project.scripts]
 ptdiag = "ptdiag.cli:main"
 pristontale-eu = "ptlinux.cli:main"
+
+[tool.setuptools]
+package-dir = {"" = "src"}
+include-package-data = true
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.setuptools.package-data]
+ptlinux = ["launcher-update-public.pem", "native/*"]
+
+[tool.ruff]
+target-version = "py311"
+line-length = 100
+extend-exclude = [
+    ".artifacts",
+    ".venv",
+    "candidates",
+    "dist",
+    "results",
+]
+
+[tool.ruff.lint]
+select = ["E4", "E7", "E9", "F"]

src/ptdiag/__init__.py

@@ -13,9 +13,9 @@ __version__ = "0.1.0"
 def __getattr__(name: str) -> Any:
 	"""Load diagnostic configuration helpers only when the full harness needs them.
 
-	The production launcher ships only :mod:`ptdiag.assbin`, which it uses for
+	The launcher release retains :mod:`ptdiag.assbin` and :mod:`ptdiag.logs` as
-	verified scene handling. Deferring the larger diagnostic-only imports keeps
+	compatibility façades. Deferring the larger diagnostic-only imports keeps the
-	the compact package importable without shipping the investigation harness.
+	compact package importable without shipping the investigation harness.
 	"""
 	if name in {"AppConfig", "ConfigError", "load_config"}:
 		from .config import AppConfig, ConfigError, load_config

src/ptdiag/artifacts.py

@@ -0,0 +1,22 @@
+"""Generated diagnostic output paths for checkout-only experiments."""
+
+from __future__ import annotations
+
+import os
+from pathlib import Path
+from typing import Mapping
+
+from .config import repository_root
+
+
+RESULTS_ROOT_ENVIRONMENT_VARIABLE = "PTDIAG_RESULTS_ROOT"
+
+
+def default_results_root(environment: Mapping[str, str] | None = None) -> Path:
+	"""Return the configurable root for generated diagnostic evidence."""
+
+	values = os.environ if environment is None else environment
+	explicit = values.get(RESULTS_ROOT_ENVIRONMENT_VARIABLE, "").strip()
+	if explicit:
+		return Path(explicit).expanduser().absolute()
+	return repository_root() / ".artifacts/diagnostics/results"

src/ptdiag/assbin.py

@@ -0,0 +1,72 @@
+"""Compatibility façade for launcher-owned wrapped Assbin handling."""
+
+from ptlinux.game.compatibility.assbin import (
+	ASSBIN_CHUNK_AIANIMATION,
+	ASSBIN_CHUNK_AIMATERIAL,
+	ASSBIN_CHUNK_AIMATERIALPROPERTY,
+	ASSBIN_CHUNK_AIMESH,
+	ASSBIN_CHUNK_AINODE,
+	ASSBIN_CHUNK_AISCENE,
+	ASSBIN_CHUNK_AITEXTURE,
+	ASSBIN_HEADER_LENGTH,
+	MAX_CAPTURE_LENGTH,
+	MAX_STRING_LENGTH,
+	PROPERTY_TYPE_NAMES,
+	READ_CHUNK_SIZE,
+	AssbinError,
+	AssbinHeader,
+	BlobSummary,
+	BytesReader,
+	Chunk,
+	EmbeddedTexture,
+	Material,
+	MaterialProperty,
+	PngMetadata,
+	Reader,
+	SceneCounts,
+	SceneInspection,
+	XorFileReader,
+	_inspect_png,
+	_png_scanlines_sha256,
+	extract_embedded_texture,
+	inspect_wrapped_assbin,
+	normalize_png_16_rgb_to_8,
+	normalize_wrapped_assbin_textures,
+	xor_bytes,
+)
+
+
+__all__ = [
+	"ASSBIN_CHUNK_AIANIMATION",
+	"ASSBIN_CHUNK_AIMATERIAL",
+	"ASSBIN_CHUNK_AIMATERIALPROPERTY",
+	"ASSBIN_CHUNK_AIMESH",
+	"ASSBIN_CHUNK_AINODE",
+	"ASSBIN_CHUNK_AISCENE",
+	"ASSBIN_CHUNK_AITEXTURE",
+	"ASSBIN_HEADER_LENGTH",
+	"MAX_CAPTURE_LENGTH",
+	"MAX_STRING_LENGTH",
+	"PROPERTY_TYPE_NAMES",
+	"READ_CHUNK_SIZE",
+	"AssbinError",
+	"AssbinHeader",
+	"BlobSummary",
+	"BytesReader",
+	"Chunk",
+	"EmbeddedTexture",
+	"Material",
+	"MaterialProperty",
+	"PngMetadata",
+	"Reader",
+	"SceneCounts",
+	"SceneInspection",
+	"XorFileReader",
+	"_inspect_png",
+	"_png_scanlines_sha256",
+	"extract_embedded_texture",
+	"inspect_wrapped_assbin",
+	"normalize_png_16_rgb_to_8",
+	"normalize_wrapped_assbin_textures",
+	"xor_bytes",
+]

src/ptdiag/config.py

@@ -9,7 +9,8 @@ import re
 import tomllib
 
 
-DEFAULT_CONFIG_PATH = Path("config/local.toml")
+DEFAULT_CONFIG_PATH = Path("diagnostics/config/local.toml")
+LEGACY_CONFIG_PATH = Path("config/local.toml")
 
 
 class ConfigError(ValueError):
@@ -53,19 +54,48 @@ class AppConfig:
 
 
 def project_root() -> Path:
+	"""Return the Python source root used by checkout-only helper commands."""
+
 	return Path(__file__).resolve().parent.parent
 
 
+def repository_root() -> Path:
+	"""Return the repository root while retaining flat-install compatibility."""
+
+	source_root = project_root()
+	checkout_root = source_root.parent
+	if source_root.name == "src" and (checkout_root / "pyproject.toml").is_file():
+		return checkout_root
+	return source_root
+
+
+def diagnostics_root() -> Path:
+	return repository_root() / "diagnostics"
+
+
+def resolve_config_path(path: str | Path | None = None) -> Path:
+	if path is not None:
+		return Path(path).expanduser().absolute()
+	root = repository_root()
+	preferred = root / DEFAULT_CONFIG_PATH
+	legacy = root / LEGACY_CONFIG_PATH
+	if preferred.is_file():
+		return preferred.absolute()
+	if legacy.is_file():
+		return legacy.absolute()
+	return preferred.absolute()
+
+
 def load_config(path: str | Path | None = None) -> AppConfig:
-	config_path = Path(path) if path is not None else project_root() / DEFAULT_CONFIG_PATH
+	config_path = resolve_config_path(path)
-	config_path = config_path.expanduser().absolute()
 	try:
 		with config_path.open("rb") as handle:
 			data = tomllib.load(handle)
 	except FileNotFoundError as exc:
 		raise ConfigError(
 			f"Configuration not found: {config_path}. "
-			"Copy config/local.example.toml to config/local.toml."
+			"Copy diagnostics/config/local.example.toml to "
+			"diagnostics/config/local.toml. Legacy config/local.toml is also recognized."
 		) from exc
 	except tomllib.TOMLDecodeError as exc:
 		raise ConfigError(f"Invalid TOML in {config_path}: {exc}") from exc

src/ptdiag/experiment.py

@@ -0,0 +1,775 @@
+"""Controlled Proton 7 runtime experiments and result generation."""
+
+from __future__ import annotations
+
+from dataclasses import replace
+from datetime import datetime
+import json
+import os
+from pathlib import Path
+import shutil
+import signal
+import subprocess
+import time
+from typing import Any, Mapping, Sequence
+
+from .artifacts import default_results_root
+from .config import AppConfig, project_root
+from .experiments.cleanup import (
+	DISPOSABLE_DIRECTORY_NAME as _DISPOSABLE_DIRECTORY_NAME,
+	cleanup_checked as _cleanup_checked_impl,
+	command_ok as _command_ok,
+	registry_restore_command as _registry_restore_command_impl,
+	registry_restore_commands as _registry_restore_commands_impl,
+	registry_setup_commands as _registry_setup_commands_impl,
+	remove_disposable_game as _remove_disposable_game_impl,
+	replace_game_link as _replace_game_link,
+	require_command as _require_command,
+	restore_game_link as _restore_game_link,
+	run_checked_commands as _run_checked_commands,
+	validate_disposable_path as _validate_disposable_path_impl,
+)
+from .experiments.evidence import (
+	collect_dll_overrides as _collect_dll_overrides_impl,
+	collect_hashes as _collect_hashes_impl,
+	desktop_name as _desktop_name,
+	finalize_result as _finalize_impl,
+	render_report as _report,
+	serialize_log_state as _serialize_log_state,
+	serialize_log_states as _serialize_log_states,
+	setup_failure_summary as _setup_failure_summary,
+	write_text as _write_text,
+)
+from .experiments.execution import (
+	capture_game_process as _capture_game_process_impl,
+	game_processes as _game_processes_impl,
+	run_and_watch as _run_and_watch_impl,
+	stop_process_group as _stop_process_group_impl,
+)
+from .experiments.log_selection import (
+	capture_current_native_logs,
+	native_log_priority as _native_log_priority,
+	observe_current_native_logs,
+	scene_import_survived,
+)
+from .experiments.models import ExperimentError, ExperimentResult
+from .experiments.preparation import (
+	_allocated_tree_bytes,
+	_apply_disposable_ini_overrides,
+	_dry_run_commands,
+	_ini_override_command,
+	_inspect_ini_overrides,
+	_launch_argv,
+	_log_modification_plan,
+	_preflight as _preflight_impl,
+	_prepare_disposable_game,
+	_prepare_state_cache,
+	_proton_command,
+	_proton_environment,
+	_resource_copy_paths,
+	_runtime_environment,
+	_safe_game_file,
+	_safe_resource_relative_path,
+	_state_cache_file_snapshot,
+	_state_cache_plan,
+)
+from .filesystem import sha256_file, verify_known_game_hashes
+from .logs import (
+	LogFileState,
+	discover_current_native_logs,
+	parse_current_run_log,
+	read_current_run_log_text,
+	snapshot_native_logs,
+)
+from .ini import IniError
+from .performance import PerformanceSampler
+from .prefix import (
+	PrefixSafetyError,
+	cleanup_dedicated_wineserver,
+)
+from .process import collect_environment
+from .registry import (
+	DesktopRegistrySnapshot,
+	desktop_registry_restored,
+	read_registry_string_values,
+	snapshot_desktop_registry,
+)
+from .result import ResultDirectory, create_result_directory, write_json
+from .runner import CommandLogger
+from .testcase import Testcase
+from .trace import process_trace_shards
+
+
+def run_experiment(
+	config: AppConfig,
+	testcase: Testcase,
+	*,
+	dry_run: bool,
+	results_root: Path | None = None,
+) -> ExperimentResult:
+	if testcase.modification is not None:
+		return _run_modified_experiment(
+			config,
+			testcase,
+			dry_run=dry_run,
+			results_root=results_root,
+		)
+	return _run_standard_experiment(
+		config,
+		testcase,
+		dry_run=dry_run,
+		results_root=results_root,
+	)
+
+
+def _run_standard_experiment(
+	config: AppConfig,
+	testcase: Testcase,
+	*,
+	dry_run: bool,
+	results_root: Path | None = None,
+	prepared_result: ResultDirectory | None = None,
+	started_at: datetime | None = None,
+) -> ExperimentResult:
+	started_at = started_at or datetime.now().astimezone()
+	result = prepared_result or create_result_directory(
+		results_root or default_results_root(), testcase.name, started_at
+	)
+	logger = CommandLogger(result.commands_path)
+	(result.path / "runner.log").touch(exist_ok=True)
+	(result.path / "native.log").touch(exist_ok=True)
+	environment = collect_environment(config)
+	hashes = _collect_hashes(config, testcase)
+	write_json(result.path / "hashes.json", {"files": hashes})
+
+	desktop_name = _desktop_name(result.path)
+	metadata: dict[str, Any] = {
+		"test": testcase.name,
+		"description": testcase.description,
+		"started_at": started_at.isoformat(),
+		"result_directory": str(result.path),
+		"dry_run": dry_run,
+		"testcase": testcase.to_dict(),
+		"config_source": str(config.source),
+		"desktop_name": desktop_name,
+		"native_log_directory": str(config.paths.native_logs),
+	}
+	write_json(result.metadata_path, metadata)
+
+	preflight_errors = _preflight(config, testcase, environment, hashes)
+	baseline = snapshot_native_logs(config.paths.native_logs)
+	metadata["old_log_baseline"] = _serialize_log_states(baseline)
+	write_json(result.metadata_path, metadata)
+	registry_before: DesktopRegistrySnapshot | None = None
+	try:
+		registry_before = snapshot_desktop_registry(config.proton7.prefix, desktop_name)
+	except OSError as exc:
+		preflight_errors.append(f"Could not snapshot dedicated-prefix registry: {exc}")
+
+	launch_argv = _launch_argv(config, testcase, result.path)
+	env_overrides = _runtime_environment(config, testcase, result.path)
+	state_cache_summary = _state_cache_plan(config, env_overrides)
+	dll_overrides = (
+		_collect_dll_overrides(config.proton7.prefix)
+		if testcase.capture.dll_overrides
+		else {}
+	)
+	_write_text(
+		result.path / "environment.txt",
+		json.dumps(
+			{
+				"preflight": environment,
+				"runtime_overrides": dict(sorted(env_overrides.items())),
+				"dll_overrides": dll_overrides,
+			},
+			indent=2,
+			sort_keys=True,
+		),
+	)
+	metadata["dll_overrides"] = dll_overrides
+	write_json(result.metadata_path, metadata)
+	summary: dict[str, Any] = {
+		"ok": False,
+		"status": "preflight-failed" if preflight_errors else "prepared",
+		"dry_run": dry_run,
+		"test": testcase.name,
+		"result_directory": str(result.path),
+		"preflight": {
+			"ok": not preflight_errors,
+			"errors": preflight_errors,
+		},
+		"launch": {
+			"argv": launch_argv,
+			"cwd": str(config.paths.live_game),
+			"env_overrides": dict(sorted(env_overrides.items())),
+			"timeout_seconds": testcase.timeout_seconds,
+		},
+		"native_log": {
+			"directory": str(config.paths.native_logs),
+			"baseline": _serialize_log_states(baseline),
+			"source": None,
+			"current_run_bytes": 0,
+		},
+		"registry": {
+			"temporary_change": testcase.display.virtual_desktop,
+			"before": registry_before.to_dict() if registry_before else None,
+			"after": None,
+			"restored": None,
+		},
+		"dxvk_state_cache": state_cache_summary,
+	}
+
+	if preflight_errors:
+		_finalize(result, summary)
+		return ExperimentResult(result.path, summary, 2)
+	assert registry_before is not None
+
+	if dry_run:
+		_dry_run_commands(
+			config,
+			testcase,
+			logger,
+			registry_before,
+			launch_argv,
+			env_overrides,
+		)
+		registry_after = snapshot_desktop_registry(config.proton7.prefix, desktop_name)
+		summary["registry"]["after"] = registry_after.to_dict()
+		summary["registry"]["restored"] = desktop_registry_restored(
+			registry_before, registry_after
+		)
+		summary["status"] = "dry-run"
+		summary["ok"] = True
+		summary["review_gate"] = (
+			"Phase C dry-run complete; review artifacts before a live Game.exe launch."
+		)
+		_finalize(result, summary)
+		return ExperimentResult(result.path, summary, 0)
+
+	runtime_exit = 1
+	setup_complete = False
+	try:
+		if state_cache_summary is not None:
+			state_cache_summary = _prepare_state_cache(
+				config,
+				env_overrides,
+				logger,
+			)
+			summary["dxvk_state_cache"] = state_cache_summary
+		_cleanup_checked(config, logger)
+		if testcase.display.virtual_desktop:
+			_run_checked_commands(
+				logger,
+				_registry_setup_commands(config, desktop_name, testcase.display.size),
+				cwd=config.paths.live_game,
+				env_overrides=_proton_environment(config),
+			)
+		setup_complete = True
+		baseline = snapshot_native_logs(config.paths.native_logs)
+		metadata["old_log_baseline"] = _serialize_log_states(baseline)
+		write_json(result.metadata_path, metadata)
+		runtime = _run_and_watch(
+			config,
+			testcase,
+			result,
+			logger,
+			launch_argv,
+			env_overrides,
+			baseline,
+		)
+		summary["runtime"] = runtime
+		summary["native_log"].update(runtime.pop("native_log"))
+		runtime_exit = (
+			0
+			if runtime.get("failure_detected") or runtime.get("scene_import_survived")
+			else 1
+		)
+		trigger_epoch = runtime.get("trigger_epoch")
+		if testcase.capture.strace_files and isinstance(trigger_epoch, (int, float)):
+			trace = process_trace_shards(
+				result.path / "raw-strace",
+				result.path,
+				trigger_epoch=float(trigger_epoch),
+				focus_before_seconds=testcase.capture.focus_before_seconds,
+				focus_after_seconds=testcase.capture.focus_after_seconds,
+				live_game=config.paths.live_game,
+			)
+			summary["trace"] = trace.to_dict()
+		else:
+			summary["trace"] = None
+		if runtime.get("failure_detected"):
+			summary["status"] = "captured-scene-failure"
+		elif runtime.get("scene_import_survived"):
+			summary["status"] = "scene-import-survived"
+		else:
+			summary["status"] = "no-trigger"
+		summary["ok"] = bool(
+			runtime.get("failure_detected") or runtime.get("scene_import_survived")
+		)
+	except (
+		ExperimentError,
+		OSError,
+		ValueError,
+		PrefixSafetyError,
+		subprocess.SubprocessError,
+	) as exc:
+		summary["status"] = "runner-error"
+		summary["error"] = str(exc)
+		summary["ok"] = False
+		runtime_exit = 2
+	finally:
+		cleanup_error: str | None = None
+		try:
+			_cleanup_checked(config, logger)
+		except (ExperimentError, OSError, ValueError, PrefixSafetyError) as exc:
+			cleanup_error = str(exc)
+		if testcase.display.virtual_desktop and setup_complete:
+			try:
+				_run_checked_commands(
+					logger,
+					_registry_restore_commands(config, registry_before),
+					cwd=config.paths.live_game,
+					env_overrides=_proton_environment(config),
+				)
+			except ExperimentError as exc:
+				cleanup_error = f"{cleanup_error}; {exc}" if cleanup_error else str(exc)
+		try:
+			registry_after = snapshot_desktop_registry(config.proton7.prefix, desktop_name)
+			summary["registry"]["after"] = registry_after.to_dict()
+			summary["registry"]["restored"] = desktop_registry_restored(
+				registry_before, registry_after
+			)
+		except OSError as exc:
+			cleanup_error = f"{cleanup_error}; {exc}" if cleanup_error else str(exc)
+		if cleanup_error:
+			summary["cleanup_error"] = cleanup_error
+			summary["ok"] = False
+			runtime_exit = 2
+		if state_cache_summary is not None:
+			state_cache_summary["after"] = _state_cache_file_snapshot(
+				Path(str(state_cache_summary["cache_file"]))
+			)
+			summary["dxvk_state_cache"] = state_cache_summary
+
+	_finalize(result, summary)
+	return ExperimentResult(result.path, summary, runtime_exit)
+
+
+def _run_modified_experiment(
+	config: AppConfig,
+	testcase: Testcase,
+	*,
+	dry_run: bool,
+	results_root: Path | None,
+) -> ExperimentResult:
+	modification = testcase.modification
+	assert modification is not None
+	started_at = datetime.now().astimezone()
+	result = create_result_directory(
+		results_root or default_results_root(), testcase.name, started_at
+	)
+	(result.path / "runner.log").touch(exist_ok=True)
+	(result.path / "native.log").touch(exist_ok=True)
+	logger = CommandLogger(result.commands_path)
+	source_environment = collect_environment(config)
+	source_hashes = _collect_hashes(config, testcase)
+	source_errors = _preflight(config, testcase, source_environment, source_hashes)
+	write_json(
+		result.path / "source-preflight.json",
+		{
+			"environment": source_environment,
+			"hashes": source_hashes,
+			"ok": not source_errors,
+			"errors": source_errors,
+		},
+	)
+	disposable_game = (
+		config.paths.app_root / _DISPOSABLE_DIRECTORY_NAME / result.path.name
+	).absolute()
+	modification_summary: dict[str, Any] = {
+		"kind": modification.kind,
+		"source": modification.source,
+		"destination": modification.destination,
+		"texture_indices": list(modification.texture_indices),
+		"ini_overrides": [
+			{
+				"path": item.path,
+				"section": item.section,
+				"key": item.key,
+				"expected": item.expected,
+				"value": item.value,
+			}
+			for item in modification.ini_overrides
+		],
+		"disposable_game": str(disposable_game),
+		"source_preflight_ok": not source_errors,
+		"prepared": False,
+		"prefix_link_restored": None,
+		"disposable_removed": None,
+	}
+	write_json(result.path / "modification.json", modification_summary)
+	if source_errors:
+		summary = _setup_failure_summary(
+			testcase, result, dry_run, source_errors, modification_summary
+		)
+		_finalize(result, summary)
+		return ExperimentResult(result.path, summary, 2)
+
+	try:
+		source, live_destination = _resource_copy_paths(
+			config.paths.live_game, modification
+		)
+		ini_preflight = _inspect_ini_overrides(
+			config.paths.live_game,
+			modification.ini_overrides,
+		)
+		for item in ini_preflight:
+			if not item["matches_expected"]:
+				raise ExperimentError(
+					f"INI preflight mismatch for [{item['section']}] {item['key']}: "
+					f"expected {item['expected']!r}, found {item['current']!r}"
+				)
+	except (OSError, ValueError, ExperimentError) as exc:
+		summary = _setup_failure_summary(
+			testcase, result, dry_run, [str(exc)], modification_summary
+		)
+		_finalize(result, summary)
+		return ExperimentResult(result.path, summary, 2)
+
+	modification_summary.update(
+		{
+			"source_path": str(source),
+			"live_destination_path": str(live_destination),
+			"live_destination_existed_before": live_destination.exists(),
+			"source_sha256": sha256_file(source),
+			"source_size": source.stat().st_size,
+			"ini_preflight": ini_preflight,
+		}
+	)
+	if dry_run:
+		_log_modification_plan(
+			logger,
+			config,
+			disposable_game,
+			source,
+			modification,
+		)
+		outcome = _run_standard_experiment(
+			config,
+			testcase,
+			dry_run=True,
+			prepared_result=result,
+			started_at=started_at,
+		)
+		modification_summary["status"] = "planned-only"
+		outcome.summary["modification"] = modification_summary
+		write_json(result.path / "modification.json", modification_summary)
+		_finalize(result, outcome.summary)
+		return outcome
+
+	prefix_link = (
+		config.proton7.prefix / "drive_c/Program Files (x86)/Pristontale EU"
+	)
+	original_link_target: str | None = None
+	link_changed = False
+	disposable_created = False
+	runtime_config = config
+	outcome: ExperimentResult | None = None
+	setup_error: str | None = None
+	cleanup_errors: list[str] = []
+	try:
+		_cleanup_checked(config, logger)
+		preparation = _prepare_disposable_game(
+			config,
+			result,
+			logger,
+			modification,
+			disposable_game,
+			source,
+		)
+		disposable_created = True
+		modification_summary.update(preparation)
+		original_link_target = _replace_game_link(
+			prefix_link,
+			disposable_game,
+			config.paths.live_game,
+			logger,
+		)
+		link_changed = True
+		modification_summary.update(
+			{
+				"prefix_link": str(prefix_link),
+				"prefix_link_original_target": original_link_target,
+				"prefix_link_runtime_target": str(disposable_game),
+			}
+		)
+		runtime_config = replace(
+			config,
+			paths=replace(
+				config.paths,
+				live_game=disposable_game,
+				native_logs=disposable_game / "save/logs",
+			),
+		)
+		modification_summary["prepared"] = True
+		write_json(result.path / "modification.json", modification_summary)
+		outcome = _run_standard_experiment(
+			runtime_config,
+			testcase,
+			dry_run=False,
+			prepared_result=result,
+			started_at=started_at,
+		)
+	except (
+		ExperimentError,
+		OSError,
+		ValueError,
+		PrefixSafetyError,
+		subprocess.SubprocessError,
+	) as exc:
+		setup_error = str(exc)
+	finally:
+		try:
+			_cleanup_checked(runtime_config, logger)
+		except (ExperimentError, OSError, ValueError, PrefixSafetyError) as exc:
+			cleanup_errors.append(f"wineserver cleanup: {exc}")
+		if disposable_created and disposable_game.exists() and modification.ini_overrides:
+			try:
+				modification_summary["ini_runtime_final"] = _inspect_ini_overrides(
+					disposable_game,
+					modification.ini_overrides,
+				)
+			except (ExperimentError, IniError, OSError) as exc:
+				cleanup_errors.append(f"final INI capture: {exc}")
+		if link_changed and original_link_target is not None:
+			try:
+				_restore_game_link(
+					prefix_link,
+					original_link_target,
+					config.paths.live_game,
+					logger,
+				)
+				modification_summary["prefix_link_restored"] = True
+			except (ExperimentError, OSError) as exc:
+				modification_summary["prefix_link_restored"] = False
+				cleanup_errors.append(f"prefix link restore: {exc}")
+		if disposable_created or disposable_game.exists():
+			try:
+				_remove_disposable_game(config, result, disposable_game, logger)
+				modification_summary["disposable_removed"] = True
+			except (ExperimentError, OSError) as exc:
+				modification_summary["disposable_removed"] = False
+				cleanup_errors.append(f"disposable cleanup: {exc}")
+
+	if outcome is None:
+		errors = [setup_error or "Modified experiment did not start", *cleanup_errors]
+		summary = _setup_failure_summary(
+			testcase, result, False, errors, modification_summary
+		)
+		exit_code = 2
+	else:
+		summary = outcome.summary
+		exit_code = outcome.exit_code
+		if setup_error:
+			summary["status"] = "setup-error"
+			summary["error"] = setup_error
+			summary["ok"] = False
+			exit_code = 2
+		if cleanup_errors:
+			summary["cleanup_error"] = "; ".join(cleanup_errors)
+			summary["ok"] = False
+			exit_code = 2
+	summary["modification"] = modification_summary
+	write_json(result.path / "modification.json", modification_summary)
+	_finalize(result, summary)
+	return ExperimentResult(result.path, summary, exit_code)
+
+
+def _remove_disposable_game(
+	config: AppConfig,
+	result: ResultDirectory,
+	disposable_game: Path,
+	logger: CommandLogger,
+) -> None:
+	_remove_disposable_game_impl(
+		config,
+		result,
+		disposable_game,
+		logger,
+		directory_name=_DISPOSABLE_DIRECTORY_NAME,
+	)
+
+
+def _validate_disposable_path(
+	staging_root: Path,
+	path: Path,
+	expected_name: str,
+) -> None:
+	_validate_disposable_path_impl(
+		staging_root,
+		path,
+		expected_name,
+		directory_name=_DISPOSABLE_DIRECTORY_NAME,
+	)
+
+
+def _preflight(
+	config: AppConfig,
+	testcase: Testcase,
+	environment: Mapping[str, Any],
+	hashes: list[dict[str, Any]],
+) -> list[str]:
+	return _preflight_impl(
+		config,
+		testcase,
+		environment,
+		hashes,
+		game_processes=_game_processes,
+	)
+
+
+def _run_and_watch(
+	config: AppConfig,
+	testcase: Testcase,
+	result: ResultDirectory,
+	logger: CommandLogger,
+	argv: Sequence[str],
+	env_overrides: Mapping[str, str],
+	baseline: Mapping[str, LogFileState],
+) -> dict[str, Any]:
+	return _run_and_watch_impl(
+		config,
+		testcase,
+		result,
+		logger,
+		argv,
+		env_overrides,
+		baseline,
+		popen=subprocess.Popen,
+		clock_ns=time.time_ns,
+		sleep=time.sleep,
+		now=lambda: datetime.now().astimezone(),
+		environment_factory=lambda: os.environ.copy(),
+		json_writer=write_json,
+		process_capture=_capture_game_process,
+		process_stopper=_stop_process_group,
+		performance_sampler_factory=PerformanceSampler,
+		log_observer=observe_current_native_logs,
+		log_capture=capture_current_native_logs,
+		scene_survived=scene_import_survived,
+		serialize_state=_serialize_log_state,
+		text_writer=_write_text,
+		prioritize_log=_native_log_priority,
+		discover_logs=discover_current_native_logs,
+		parse_log=parse_current_run_log,
+		read_log=read_current_run_log_text,
+		snapshot_logs=snapshot_native_logs,
+	)
+
+
+def _stop_process_group(process: subprocess.Popen[str]) -> None:
+	_stop_process_group_impl(
+		process,
+		kill_group=os.killpg,
+		signals=(
+			(signal.SIGINT, 5.0),
+			(signal.SIGTERM, 5.0),
+			(signal.SIGKILL, 3.0),
+		),
+	)
+
+
+def _capture_game_process(
+	testcase: Testcase,
+	result_directory: Path,
+) -> dict[str, Any] | None:
+	return _capture_game_process_impl(
+		testcase,
+		result_directory,
+		game_process_scan=_game_processes,
+		proc_root=Path("/proc"),
+		copy_file=shutil.copyfile,
+	)
+
+
+def _game_processes() -> list[int]:
+	return _game_processes_impl(proc_root=Path("/proc"))
+
+
+def _registry_setup_commands(
+	config: AppConfig,
+	desktop_name: str,
+	desktop_size: str,
+) -> list[list[str]]:
+	return _registry_setup_commands_impl(
+		config,
+		desktop_name,
+		desktop_size,
+		proton_command=_proton_command,
+	)
+
+
+def _registry_restore_commands(
+	config: AppConfig,
+	snapshot: DesktopRegistrySnapshot,
+) -> list[list[str]]:
+	return _registry_restore_commands_impl(
+		config,
+		snapshot,
+		proton_command=_proton_command,
+	)
+
+
+def _registry_restore_command(
+	config: AppConfig,
+	key: str,
+	name: str,
+	existed: bool,
+	value: str | None,
+) -> list[str]:
+	return _registry_restore_command_impl(
+		config,
+		key,
+		name,
+		existed,
+		value,
+		proton_command=_proton_command,
+	)
+
+
+def _cleanup_checked(config: AppConfig, logger: CommandLogger) -> None:
+	_cleanup_checked_impl(
+		config,
+		logger,
+		cleaner=cleanup_dedicated_wineserver,
+	)
+
+
+def _collect_hashes(
+	config: AppConfig,
+	testcase: Testcase,
+) -> list[dict[str, Any]]:
+	return _collect_hashes_impl(
+		config,
+		testcase,
+		repository_root=project_root(),
+		verifier=verify_known_game_hashes,
+		hash_file=sha256_file,
+	)
+
+
+def _collect_dll_overrides(prefix: Path) -> dict[str, str]:
+	return _collect_dll_overrides_impl(
+		prefix,
+		reader=read_registry_string_values,
+	)
+
+
+def _finalize(result: ResultDirectory, summary: dict[str, Any]) -> None:
+	_finalize_impl(
+		result,
+		summary,
+		json_writer=write_json,
+		text_writer=_write_text,
+		report_renderer=_report,
+	)

src/ptdiag/experiments/__init__.py

@@ -0,0 +1 @@
+"""Controlled diagnostic experiment implementation modules."""

src/ptdiag/experiments/cleanup.py

@@ -0,0 +1,287 @@
+"""Experiment cleanup, prefix-link rollback, and registry restoration."""
+
+from __future__ import annotations
+
+from collections.abc import Callable, Mapping, Sequence
+import os
+from pathlib import Path
+
+from ..config import AppConfig
+from ..prefix import cleanup_dedicated_wineserver
+from ..registry import DesktopRegistrySnapshot
+from ..result import ResultDirectory
+from ..runner import CommandLogger, CommandResult
+from .models import ExperimentError
+
+
+EXPLORER_KEY = r"HKCU\Software\Wine\Explorer"
+DESKTOPS_KEY = r"HKCU\Software\Wine\Explorer\Desktops"
+DISPOSABLE_DIRECTORY_NAME = "ptdiag-disposable"
+
+ProtonCommand = Callable[..., list[str]]
+WineserverCleaner = Callable[..., CommandResult]
+
+
+def replace_game_link(
+	prefix_link: Path,
+	disposable_game: Path,
+	expected_live_game: Path,
+	logger: CommandLogger,
+) -> str:
+	"""Point the dedicated prefix at a verified disposable game tree."""
+
+	if not prefix_link.is_symlink():
+		raise ExperimentError(
+			f"Dedicated-prefix game path is not a symlink: {prefix_link}"
+		)
+	if prefix_link.resolve(strict=True) != expected_live_game.resolve(strict=True):
+		raise ExperimentError("Dedicated-prefix game link changed after source preflight")
+	original_target = os.readlink(prefix_link)
+	require_command(
+		logger.run(
+			["ln", "-sfn", "--", str(disposable_game), str(prefix_link)],
+			cwd=prefix_link.parent,
+			timeout_seconds=15.0,
+		),
+		"point dedicated prefix at disposable game",
+	)
+	if (
+		not prefix_link.is_symlink()
+		or prefix_link.resolve(strict=True) != disposable_game.resolve(strict=True)
+	):
+		raise ExperimentError(
+			"Dedicated-prefix game link did not resolve to disposable copy"
+		)
+	return original_target
+
+
+def restore_game_link(
+	prefix_link: Path,
+	original_target: str,
+	expected_live_game: Path,
+	logger: CommandLogger,
+) -> None:
+	"""Restore the dedicated-prefix game link and verify its exact target."""
+
+	require_command(
+		logger.run(
+			["ln", "-sfn", "--", original_target, str(prefix_link)],
+			cwd=prefix_link.parent,
+			timeout_seconds=15.0,
+		),
+		"restore dedicated-prefix game link",
+	)
+	if not prefix_link.is_symlink():
+		raise ExperimentError("Restored dedicated-prefix game path is not a symlink")
+	if os.readlink(prefix_link) != original_target:
+		raise ExperimentError("Dedicated-prefix game link text was not restored exactly")
+	if prefix_link.resolve(strict=True) != expected_live_game.resolve(strict=True):
+		raise ExperimentError("Dedicated-prefix game link target was not restored")
+
+
+def remove_disposable_game(
+	config: AppConfig,
+	result: ResultDirectory,
+	disposable_game: Path,
+	logger: CommandLogger,
+	*,
+	directory_name: str = DISPOSABLE_DIRECTORY_NAME,
+) -> None:
+	"""Remove only the result-scoped disposable tree beneath its managed root."""
+
+	staging_root = (config.paths.app_root / directory_name).absolute()
+	validate_disposable_path(
+		staging_root,
+		disposable_game,
+		result.path.name,
+		directory_name=directory_name,
+	)
+	require_command(
+		logger.run(
+			["rm", "-rf", "--one-file-system", "--", str(disposable_game)],
+			timeout_seconds=900.0,
+		),
+		"remove disposable game tree",
+	)
+	if disposable_game.exists() or disposable_game.is_symlink():
+		raise ExperimentError(
+			f"Disposable game cleanup left its target: {disposable_game}"
+		)
+	try:
+		staging_root.rmdir()
+	except OSError:
+		pass
+
+
+def validate_disposable_path(
+	staging_root: Path,
+	path: Path,
+	expected_name: str,
+	*,
+	directory_name: str = DISPOSABLE_DIRECTORY_NAME,
+) -> None:
+	"""Reject cleanup targets outside the managed, result-scoped staging root."""
+
+	if path.parent != staging_root or path.name != expected_name:
+		raise ExperimentError(f"Unsafe disposable game path: {path}")
+	if staging_root.name != directory_name:
+		raise ExperimentError(f"Unsafe disposable staging root: {staging_root}")
+
+
+def require_command(outcome: CommandResult, operation: str) -> None:
+	if not command_ok(outcome):
+		raise ExperimentError(
+			f"Could not {operation} ({outcome.returncode}): "
+			f"{outcome.error or outcome.stderr.strip() or 'command failed'}"
+		)
+
+
+def registry_setup_commands(
+	config: AppConfig,
+	desktop_name: str,
+	desktop_size: str,
+	*,
+	proton_command: ProtonCommand,
+) -> list[list[str]]:
+	return [
+		proton_command(
+			config,
+			"runinprefix",
+			"reg.exe",
+			"add",
+			EXPLORER_KEY,
+			"/v",
+			"Desktop",
+			"/t",
+			"REG_SZ",
+			"/d",
+			desktop_name,
+			"/f",
+		),
+		proton_command(
+			config,
+			"runinprefix",
+			"reg.exe",
+			"add",
+			DESKTOPS_KEY,
+			"/v",
+			desktop_name,
+			"/t",
+			"REG_SZ",
+			"/d",
+			desktop_size,
+			"/f",
+		),
+	]
+
+
+def registry_restore_commands(
+	config: AppConfig,
+	snapshot: DesktopRegistrySnapshot,
+	*,
+	proton_command: ProtonCommand,
+) -> list[list[str]]:
+	return [
+		registry_restore_command(
+			config,
+			EXPLORER_KEY,
+			"Desktop",
+			snapshot.selected_desktop.exists,
+			snapshot.selected_desktop.value,
+			proton_command=proton_command,
+		),
+		registry_restore_command(
+			config,
+			DESKTOPS_KEY,
+			snapshot.desktop_name,
+			snapshot.desktop_size.exists,
+			snapshot.desktop_size.value,
+			proton_command=proton_command,
+		),
+	]
+
+
+def registry_restore_command(
+	config: AppConfig,
+	key: str,
+	name: str,
+	existed: bool,
+	value: str | None,
+	*,
+	proton_command: ProtonCommand,
+) -> list[str]:
+	if existed:
+		assert value is not None
+		return proton_command(
+			config,
+			"runinprefix",
+			"reg.exe",
+			"add",
+			key,
+			"/v",
+			name,
+			"/t",
+			"REG_SZ",
+			"/d",
+			value,
+			"/f",
+		)
+	return proton_command(
+		config,
+		"runinprefix",
+		"reg.exe",
+		"delete",
+		key,
+		"/v",
+		name,
+		"/f",
+	)
+
+
+def run_checked_commands(
+	logger: CommandLogger,
+	commands: Sequence[Sequence[str]],
+	*,
+	cwd: Path,
+	env_overrides: Mapping[str, str],
+) -> None:
+	for command in commands:
+		outcome = logger.run(
+			command,
+			cwd=cwd,
+			env_overrides=env_overrides,
+			timeout_seconds=15.0,
+		)
+		if not command_ok(outcome):
+			raise ExperimentError(
+				f"Command failed ({outcome.returncode}): {list(command)!r}: "
+				f"{outcome.error or outcome.stderr.strip()}"
+			)
+
+
+def cleanup_checked(
+	config: AppConfig,
+	logger: CommandLogger,
+	*,
+	cleaner: WineserverCleaner = cleanup_dedicated_wineserver,
+) -> None:
+	"""Stop the dedicated wineserver while accepting its idle return contract."""
+
+	outcome = cleaner(config, logger, timeout_seconds=15.0)
+	if (
+		outcome.returncode == 1
+		and not outcome.timed_out
+		and outcome.error is None
+		and not outcome.stdout
+		and not outcome.stderr
+	):
+		return
+	if not command_ok(outcome):
+		raise ExperimentError(
+			"Dedicated-prefix wineserver cleanup failed: "
+			f"{outcome.error or outcome.stderr.strip() or outcome.returncode}"
+		)
+
+
+def command_ok(result: CommandResult) -> bool:
+	return not result.timed_out and result.error is None and result.returncode == 0

src/ptdiag/experiments/evidence.py

@@ -0,0 +1,257 @@
+"""Evidence collection, serialization, and experiment report generation."""
+
+from __future__ import annotations
+
+from collections.abc import Callable, Mapping, Sequence
+import os
+from pathlib import Path
+from typing import Any, Protocol
+
+from ..config import AppConfig, project_root
+from ..filesystem import sha256_file, verify_known_game_hashes
+from ..logs import LogFileState
+from ..registry import read_registry_string_values
+from ..result import ResultDirectory, write_json
+from ..testcase import Testcase
+
+
+class HashVerification(Protocol):
+	def to_dict(self) -> dict[str, Any]: ...
+
+
+HashVerifier = Callable[[Path], Sequence[HashVerification]]
+HashFile = Callable[[Path], str]
+RegistryReader = Callable[[Path], Mapping[str, Mapping[str, str]]]
+JsonWriter = Callable[[Path, Any], None]
+TextWriter = Callable[[Path, str], None]
+ReportRenderer = Callable[[Mapping[str, Any]], str]
+
+
+def collect_hashes(
+	config: AppConfig,
+	testcase: Testcase,
+	*,
+	repository_root: Path | None = None,
+	verifier: HashVerifier = verify_known_game_hashes,
+	hash_file: HashFile = sha256_file,
+) -> list[dict[str, Any]]:
+	"""Collect the immutable inputs needed to interpret one experiment."""
+
+	root = project_root() if repository_root is None else repository_root
+	items: list[dict[str, Any]] = []
+	for verification in verifier(config.paths.live_game):
+		item = verification.to_dict()
+		item["required"] = True
+		item["role"] = "known-game-baseline"
+		items.append(item)
+	extra = {
+		config.proton7.proton: "proton-launcher",
+		config.proton7.prefix
+		/ "drive_c/windows/syswow64/d3dx9_43.dll": "native-d3dx9-43",
+		config.proton7.prefix
+		/ "drive_c/windows/syswow64/d3dcompiler_43.dll": "native-d3dcompiler-43",
+		config.proton7.prefix / "drive_c/windows/syswow64/d3d9.dll": "dxvk-d3d9",
+		root / "ptlinux/proton_compat.py": "proton-python314-shim",
+		config.source: "local-config",
+		testcase.source: "testcase",
+	}
+	dxvk_config = testcase.env.get("DXVK_CONFIG_FILE")
+	if dxvk_config:
+		dxvk_config_path = Path(dxvk_config).expanduser()
+		if not dxvk_config_path.is_absolute():
+			dxvk_config_path = (root / dxvk_config_path).absolute()
+		extra[dxvk_config_path] = "dxvk-config"
+	for path, role in extra.items():
+		item: dict[str, Any] = {
+			"path": str(path),
+			"role": role,
+			"required": role not in {"local-config", "testcase"},
+			"expected_sha256": None,
+			"actual_sha256": None,
+			"ok": False,
+			"error": None,
+		}
+		try:
+			item["actual_sha256"] = hash_file(path)
+			item["ok"] = True
+		except OSError as error:
+			item["error"] = str(error)
+		items.append(item)
+	return items
+
+
+def collect_dll_overrides(
+	prefix: Path,
+	*,
+	reader: RegistryReader = read_registry_string_values,
+) -> dict[str, str]:
+	sections = reader(prefix / "user.reg")
+	return dict(sorted(sections.get(r"Software\Wine\DllOverrides", {}).items()))
+
+
+def serialize_log_states(states: Mapping[str, LogFileState]) -> list[dict[str, Any]]:
+	return [
+		serialize_log_state(state)
+		for state in sorted(states.values(), key=lambda item: str(item.path))
+	]
+
+
+def serialize_log_state(state: LogFileState) -> dict[str, Any]:
+	return {
+		"path": str(state.path),
+		"mtime_ns": state.mtime_ns,
+		"size": state.size,
+		"inode": state.inode,
+	}
+
+
+def desktop_name(result_directory: Path) -> str:
+	digits = "".join(character for character in result_directory.name if character.isdigit())
+	return f"PTDiag{digits[-12:]}"
+
+
+def setup_failure_summary(
+	testcase: Testcase,
+	result: ResultDirectory,
+	dry_run: bool,
+	errors: Sequence[str],
+	modification: Mapping[str, Any],
+) -> dict[str, Any]:
+	return {
+		"ok": False,
+		"status": "preflight-failed" if errors else "setup-error",
+		"dry_run": dry_run,
+		"test": testcase.name,
+		"result_directory": str(result.path),
+		"preflight": {"ok": False, "errors": list(errors)},
+		"modification": dict(modification),
+		"native_log": {"source": None, "current_run_bytes": 0},
+		"registry": {"restored": None},
+	}
+
+
+def finalize_result(
+	result: ResultDirectory,
+	summary: dict[str, Any],
+	*,
+	json_writer: JsonWriter = write_json,
+	text_writer: TextWriter,
+	report_renderer: ReportRenderer,
+) -> None:
+	json_writer(result.path / "summary.json", summary)
+	text_writer(result.path / "report.md", report_renderer(summary))
+
+
+def render_report(summary: Mapping[str, Any]) -> str:
+	preflight = summary.get("preflight", {})
+	launch = summary.get("launch", {})
+	registry = summary.get("registry", {})
+	native_log = summary.get("native_log", {})
+	modification = summary.get("modification")
+	state_cache = summary.get("dxvk_state_cache")
+	runtime = summary.get("runtime")
+	lines = [
+		f"# {summary.get('test', 'experiment')}",
+		"",
+		f"Status: `{summary.get('status')}`",
+		f"Result directory: `{summary.get('result_directory')}`",
+		f"Dry run: `{summary.get('dry_run')}`",
+		"",
+		"## Preflight",
+		"",
+		(
+			f"Passed: `{preflight.get('ok')}`"
+			if isinstance(preflight, Mapping)
+			else "Passed: `False`"
+		),
+	]
+	if isinstance(preflight, Mapping):
+		for error in preflight.get("errors", []):
+			lines.append(f"- {error}")
+	lines.extend(
+		[
+			"",
+			"## Launch",
+			"",
+			f"CWD: `{launch.get('cwd')}`" if isinstance(launch, Mapping) else "",
+			(
+				f"Timeout: `{launch.get('timeout_seconds')}` seconds"
+				if isinstance(launch, Mapping)
+				else ""
+			),
+			"",
+			"## Current-run native log",
+			"",
+			(
+				f"Source: `{native_log.get('source')}`"
+				if isinstance(native_log, Mapping)
+				else ""
+			),
+			(
+				f"Captured bytes: `{native_log.get('current_run_bytes')}`"
+				if isinstance(native_log, Mapping)
+				else ""
+			),
+			"",
+			"## Registry rollback",
+			"",
+			(
+				f"Restored: `{registry.get('restored')}`"
+				if isinstance(registry, Mapping)
+				else ""
+			),
+		]
+	)
+	if summary.get("review_gate"):
+		lines.extend(["", "## Review gate", "", str(summary["review_gate"])])
+	if isinstance(runtime, Mapping) and isinstance(runtime.get("performance"), Mapping):
+		performance = runtime["performance"]
+		lines.extend(
+			[
+				"",
+				"## Performance capture",
+				"",
+				f"Samples: `{performance.get('sample_count')}`",
+				f"Interval: `{performance.get('interval_seconds')}` seconds",
+				f"CSV: `{performance.get('output')}`",
+			]
+		)
+	if isinstance(state_cache, Mapping):
+		lines.extend(
+			[
+				"",
+				"## DXVK state cache",
+				"",
+				f"Directory: `{state_cache.get('directory')}`",
+				f"Seeded: `{state_cache.get('seeded')}`",
+				f"Before: `{state_cache.get('before')}`",
+				f"After: `{state_cache.get('after')}`",
+			]
+		)
+	if isinstance(modification, Mapping):
+		lines.extend(
+			[
+				"",
+				"## Disposable modification",
+				"",
+				f"Kind: `{modification.get('kind')}`",
+				f"Source: `{modification.get('source')}`",
+				f"Destination: `{modification.get('destination')}`",
+				f"Prepared: `{modification.get('prepared')}`",
+				f"Prefix link restored: `{modification.get('prefix_link_restored')}`",
+				f"Disposable copy removed: `{modification.get('disposable_removed')}`",
+			]
+		)
+	if summary.get("error"):
+		lines.extend(["", "## Error", "", str(summary["error"])])
+	return "\n".join(line for line in lines if line is not None).rstrip() + "\n"
+
+
+def write_text(path: Path, value: str, *, pid: int | None = None) -> None:
+	"""Atomically write normalized UTF-8 text evidence."""
+
+	path.parent.mkdir(parents=True, exist_ok=True)
+	process_id = os.getpid() if pid is None else pid
+	temporary = path.with_name(f".{path.name}.{process_id}.tmp")
+	temporary.write_text(value.rstrip("\n") + "\n", encoding="utf-8")
+	temporary.replace(path)

src/ptdiag/experiments/execution.py

@@ -0,0 +1,332 @@
+"""Process execution and runtime observation for diagnostic experiments."""
+
+from __future__ import annotations
+
+from collections.abc import Callable, Mapping, Sequence
+from datetime import datetime
+import os
+from pathlib import Path
+import shutil
+import signal
+import subprocess
+import time
+from typing import Any
+
+from ..config import AppConfig
+from ..logs import (
+	LogFileState,
+	discover_current_native_logs,
+	parse_current_run_log,
+	read_current_run_log_text,
+	snapshot_native_logs,
+)
+from ..performance import PerformanceSampler
+from ..result import ResultDirectory, write_json
+from ..runner import CommandLogger
+from ..testcase import Testcase
+from .evidence import serialize_log_state, write_text
+from .log_selection import (
+	NativeLogObservation,
+	NativeLogSelection,
+	capture_current_native_logs,
+	native_log_priority,
+	observe_current_native_logs,
+	scene_import_survived,
+)
+from .models import ExperimentError
+
+
+ProcessFactory = Callable[..., subprocess.Popen[str]]
+ProcessCapture = Callable[[Testcase, Path], dict[str, Any] | None]
+ProcessStopper = Callable[[subprocess.Popen[str]], None]
+PerformanceSamplerFactory = Callable[[int, Path], PerformanceSampler]
+JsonWriter = Callable[[Path, Any], None]
+TextWriter = Callable[[Path, str], None]
+EnvironmentFactory = Callable[[], dict[str, str]]
+LogObserver = Callable[..., Sequence[NativeLogObservation]]
+LogCapture = Callable[..., NativeLogSelection]
+LogStateSerializer = Callable[[LogFileState], dict[str, Any]]
+LogPrioritizer = Callable[
+	[LogFileState, Mapping[str, Any]],
+	tuple[int, int, int, int, str],
+]
+
+
+def game_processes(*, proc_root: Path = Path("/proc")) -> list[int]:
+	"""Return the matching game process IDs visible under one proc tree."""
+
+	result: list[int] = []
+	for entry in proc_root.iterdir():
+		if not entry.name.isdigit():
+			continue
+		try:
+			comm = (entry / "comm").read_text(encoding="utf-8").strip().casefold()
+		except OSError:
+			continue
+		if comm in {"game.exe", "gamese.exe"}:
+			result.append(int(entry.name))
+	return sorted(result)
+
+
+def capture_game_process(
+	testcase: Testcase,
+	result_directory: Path,
+	*,
+	game_process_scan: Callable[[], list[int]] = game_processes,
+	proc_root: Path = Path("/proc"),
+	copy_file: Callable[[Path, Path], str] = shutil.copyfile,
+) -> dict[str, Any] | None:
+	"""Capture the first matching process identity and optional memory map."""
+
+	processes = game_process_scan()
+	if not processes:
+		return None
+	pid = processes[0]
+	root = proc_root / str(pid)
+	identity: dict[str, Any] = {"pid": pid}
+	try:
+		identity["comm"] = (root / "comm").read_text(encoding="utf-8").strip()
+		identity["cmdline"] = (
+			(root / "cmdline").read_bytes().decode("utf-8", errors="replace").split("\0")
+		)
+		identity["cwd"] = str((root / "cwd").readlink())
+		identity["exe"] = str((root / "exe").readlink())
+		if testcase.capture.process_maps:
+			copy_file(root / "maps", result_directory / "process-maps.txt")
+	except OSError as exc:
+		identity["capture_error"] = str(exc)
+	return identity
+
+
+def stop_process_group(
+	process: subprocess.Popen[str],
+	*,
+	kill_group: Callable[[int, int], None] = os.killpg,
+	signals: Sequence[tuple[int, float]] = (
+		(signal.SIGINT, 5.0),
+		(signal.SIGTERM, 5.0),
+		(signal.SIGKILL, 3.0),
+	),
+) -> None:
+	"""Stop a launcher process group with bounded escalation."""
+
+	if process.poll() is not None:
+		return
+	for signum, timeout in signals:
+		try:
+			kill_group(process.pid, signum)
+		except ProcessLookupError:
+			return
+		try:
+			process.wait(timeout=timeout)
+			return
+		except subprocess.TimeoutExpired:
+			continue
+
+
+def _current_time() -> datetime:
+	return datetime.now().astimezone()
+
+
+def _copy_environment() -> dict[str, str]:
+	return os.environ.copy()
+
+
+def run_and_watch(
+	config: AppConfig,
+	testcase: Testcase,
+	result: ResultDirectory,
+	logger: CommandLogger,
+	argv: Sequence[str],
+	env_overrides: Mapping[str, str],
+	baseline: Mapping[str, LogFileState],
+	*,
+	popen: ProcessFactory = subprocess.Popen,
+	clock_ns: Callable[[], int] = time.time_ns,
+	sleep: Callable[[float], None] = time.sleep,
+	now: Callable[[], datetime] = _current_time,
+	environment_factory: EnvironmentFactory = _copy_environment,
+	json_writer: JsonWriter = write_json,
+	process_capture: ProcessCapture = capture_game_process,
+	process_stopper: ProcessStopper = stop_process_group,
+	performance_sampler_factory: PerformanceSamplerFactory = PerformanceSampler,
+	log_observer: LogObserver = observe_current_native_logs,
+	log_capture: LogCapture = capture_current_native_logs,
+	scene_survived: Callable[..., bool] = scene_import_survived,
+	serialize_state: LogStateSerializer = serialize_log_state,
+	text_writer: TextWriter = write_text,
+	prioritize_log: LogPrioritizer = native_log_priority,
+	discover_logs: Callable[..., Sequence[LogFileState]] = discover_current_native_logs,
+	parse_log: Callable[..., Any] = parse_current_run_log,
+	read_log: Callable[..., str] = read_current_run_log_text,
+	snapshot_logs: Callable[[Path], Mapping[str, LogFileState]] = snapshot_native_logs,
+) -> dict[str, Any]:
+	"""Run one diagnostic process and collect its current-run evidence."""
+
+	runner_log_path = result.path / "runner.log"
+	environment = environment_factory()
+	environment.update(env_overrides)
+	test_start_ns = clock_ns()
+	started_at = now()
+	json_writer(
+		result.path / "test-start.json",
+		{
+			"test_start_ns": test_start_ns,
+			"test_start_epoch": test_start_ns / 1_000_000_000,
+			"recorded_at": started_at.isoformat(),
+		},
+	)
+	process: subprocess.Popen[str] | None = None
+	process_identity: dict[str, Any] | None = None
+	failure_state: LogFileState | None = None
+	failure_trigger_mtime_ns: int | None = None
+	current_observation: NativeLogObservation | None = None
+	performance_sampler: PerformanceSampler | None = None
+	performance_summary: dict[str, Any] | None = None
+	detected_at_ns: int | None = None
+	timed_out = False
+	stop_reason = "process-exited"
+	failure_reason: str | None = None
+	with runner_log_path.open("a", encoding="utf-8") as runner_log:
+		try:
+			process = popen(
+				list(argv),
+				cwd=config.paths.live_game,
+				env=environment,
+				stdout=runner_log,
+				stderr=subprocess.STDOUT,
+				text=True,
+				start_new_session=True,
+			)
+		except OSError as exc:
+			logger.record_lifecycle(
+				argv,
+				state="launch-error",
+				cwd=config.paths.live_game,
+				env_overrides=env_overrides,
+				timeout_seconds=testcase.timeout_seconds,
+				started_at=started_at,
+				error=str(exc),
+			)
+			raise ExperimentError(f"Could not launch experiment: {exc}") from exc
+		assert process is not None
+		logger.record_lifecycle(
+			argv,
+			state="started",
+			cwd=config.paths.live_game,
+			env_overrides=env_overrides,
+			timeout_seconds=testcase.timeout_seconds,
+			started_at=started_at,
+			pid=process.pid,
+		)
+		deadline_ns = test_start_ns + int(testcase.timeout_seconds * 1_000_000_000)
+		post_failure_deadline_ns: int | None = None
+		while process.poll() is None:
+			now_ns = clock_ns()
+			if process_identity is None:
+				process_identity = process_capture(testcase, result.path)
+				if process_identity is not None and testcase.capture.performance_stats:
+					try:
+						performance_sampler = performance_sampler_factory(
+							int(process_identity["pid"]),
+							result.path / "performance.csv",
+						)
+					except (OSError, ValueError, KeyError) as exc:
+						performance_summary = {"error": str(exc)}
+			if performance_sampler is not None:
+				performance_sampler.maybe_sample(now_ns)
+			if failure_state is None:
+				for observation in log_observer(
+					config.paths.native_logs,
+					baseline,
+					test_start_ns,
+					discoverer=discover_logs,
+					parser=parse_log,
+					reader=read_log,
+				):
+					current_observation = observation
+					if observation.failure_reason is not None:
+						failure_state = observation.state
+						failure_trigger_mtime_ns = observation.state.mtime_ns
+						detected_at_ns = now_ns
+						post_failure_deadline_ns = now_ns + int(
+							testcase.stop_after_failure_seconds * 1_000_000_000
+						)
+						failure_reason = observation.failure_reason
+						break
+				if post_failure_deadline_ns is not None and now_ns >= post_failure_deadline_ns:
+					stop_reason = failure_reason or "load-texture-to-material"
+					process_stopper(process)
+					break
+			if now_ns >= deadline_ns:
+				timed_out = True
+				stop_reason = "timeout"
+				process_stopper(process)
+				break
+			sleep(0.1)
+		if process.poll() is None:
+			process_stopper(process)
+		returncode = process.wait(timeout=5.0)
+		if performance_sampler is not None:
+			performance_summary = performance_sampler.close()
+		logger.record_lifecycle(
+			argv,
+			state="finished",
+			cwd=config.paths.live_game,
+			env_overrides=env_overrides,
+			timeout_seconds=testcase.timeout_seconds,
+			started_at=started_at,
+			pid=process.pid,
+			returncode=returncode,
+			timed_out=timed_out,
+		)
+
+	selection = log_capture(
+		config.paths.native_logs,
+		baseline,
+		test_start_ns,
+		result.path,
+		fallback=current_observation,
+		failure_state=failure_state,
+		serialize_state=serialize_state,
+		write_text=text_writer,
+		prioritize=prioritize_log,
+		discoverer=discover_logs,
+		parser=parse_log,
+		reader=read_log,
+		snapshotter=snapshot_logs,
+	)
+	current_observation = selection.observation
+	current_state = current_observation.state if current_observation is not None else None
+	current_text = current_observation.text if current_observation is not None else ""
+	current_analysis = (
+		current_observation.analysis if current_observation is not None else None
+	)
+	survived = scene_survived(current_analysis, timed_out=timed_out)
+	trigger_ns = (
+		max(test_start_ns, failure_trigger_mtime_ns)
+		if failure_trigger_mtime_ns is not None
+		else None
+	)
+	return {
+		"test_start_ns": test_start_ns,
+		"test_start_epoch": test_start_ns / 1_000_000_000,
+		"finished_at": now().isoformat(),
+		"launcher_pid": process.pid if process is not None else None,
+		"game_process": process_identity,
+		"returncode": process.returncode if process is not None else None,
+		"timed_out": timed_out,
+		"stop_reason": stop_reason,
+		"failure_detected": failure_state is not None,
+		"scene_import_survived": survived,
+		"detected_at_ns": detected_at_ns,
+		"trigger_epoch": trigger_ns / 1_000_000_000 if trigger_ns is not None else None,
+		"analysis": current_analysis,
+		"native_logs": list(selection.captures),
+		"performance": performance_summary,
+		"native_log": {
+			"source": str(current_state.path) if current_state else None,
+			"state": serialize_state(current_state) if current_state else None,
+			"current_run_bytes": len(current_text.encode("utf-8")),
+		},
+	}

src/ptdiag/experiments/log_selection.py

@@ -0,0 +1,212 @@
+"""Current-run native-log observation, capture, and selection."""
+
+from __future__ import annotations
+
+from collections.abc import Callable, Mapping, Sequence
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Any, Protocol
+
+from ..logs import (
+	LogFileState,
+	discover_current_native_logs,
+	parse_current_run_log,
+	read_current_run_log_text,
+	snapshot_native_logs,
+)
+
+
+class NativeLogAnalysis(Protocol):
+	load_texture_to_material_failed: bool
+	asset_pack_health_failed: bool
+
+	def to_summary(self) -> dict[str, Any]: ...
+
+
+NativeLogDiscoverer = Callable[
+	[Path, Mapping[str, LogFileState], int],
+	Sequence[LogFileState],
+]
+NativeLogParser = Callable[
+	[LogFileState, Mapping[str, LogFileState]],
+	NativeLogAnalysis,
+]
+NativeLogReader = Callable[
+	[LogFileState, Mapping[str, LogFileState]],
+	str,
+]
+NativeLogSnapshotter = Callable[[Path], Mapping[str, LogFileState]]
+LogStateSerializer = Callable[[LogFileState], dict[str, Any]]
+NativeLogPrioritizer = Callable[
+	[LogFileState, Mapping[str, Any]],
+	tuple[int, int, int, int, str],
+]
+TextWriter = Callable[[Path, str], None]
+
+
+@dataclass(frozen=True)
+class NativeLogObservation:
+	state: LogFileState
+	text: str
+	analysis: dict[str, Any]
+	failure_reason: str | None
+
+
+@dataclass(frozen=True)
+class NativeLogSelection:
+	observation: NativeLogObservation | None
+	captures: tuple[dict[str, Any], ...]
+
+
+def observe_current_native_logs(
+	log_directory: Path,
+	baseline: Mapping[str, LogFileState],
+	test_start_ns: int,
+	*,
+	discoverer: NativeLogDiscoverer = discover_current_native_logs,
+	parser: NativeLogParser = parse_current_run_log,
+	reader: NativeLogReader = read_current_run_log_text,
+) -> tuple[NativeLogObservation, ...]:
+	"""Parse each current-run candidate and identify an actionable failure."""
+
+	observations: list[NativeLogObservation] = []
+	for state in discoverer(log_directory, baseline, test_start_ns):
+		parsed = parser(state, baseline)
+		failure_reason = (
+			"asset-pack-health"
+			if parsed.asset_pack_health_failed
+			else "load-texture-to-material"
+			if parsed.load_texture_to_material_failed
+			else None
+		)
+		observations.append(
+			NativeLogObservation(
+				state=state,
+				text=reader(state, baseline),
+				analysis=parsed.to_summary(),
+				failure_reason=failure_reason,
+			)
+		)
+	return tuple(observations)
+
+
+def capture_current_native_logs(
+	log_directory: Path,
+	baseline: Mapping[str, LogFileState],
+	test_start_ns: int,
+	result_directory: Path,
+	*,
+	fallback: NativeLogObservation | None,
+	failure_state: LogFileState | None,
+	serialize_state: LogStateSerializer,
+	write_text: TextWriter,
+	prioritize: NativeLogPrioritizer | None = None,
+	discoverer: NativeLogDiscoverer = discover_current_native_logs,
+	parser: NativeLogParser = parse_current_run_log,
+	reader: NativeLogReader = read_current_run_log_text,
+	snapshotter: NativeLogSnapshotter = snapshot_native_logs,
+) -> NativeLogSelection:
+	"""Capture all current-run logs and choose the strongest primary evidence."""
+
+	captures: list[dict[str, Any]] = []
+	candidates: list[NativeLogObservation] = []
+	for index, state in enumerate(discoverer(log_directory, baseline, test_start_ns)):
+		text = reader(state, baseline)
+		analysis = parser(state, baseline).to_summary()
+		scenes = analysis.get("scenes")
+		scene_names = (
+			sorted(str(name) for name in scenes)
+			if isinstance(scenes, Mapping)
+			else []
+		)
+		captured_path = (
+			result_directory
+			/ "native-logs"
+			/ f"{index:02d}-{state.path.name}.current.log"
+		)
+		write_text(captured_path, text)
+		captures.append(
+			{
+				"source": str(state.path),
+				"state": serialize_state(state),
+				"captured_path": str(captured_path),
+				"current_run_bytes": len(text.encode("utf-8")),
+				"scene_names": scene_names,
+				"load_texture_to_material_failed": analysis.get(
+					"load_texture_to_material_failed",
+					False,
+				),
+				"asset_pack_health_failed": analysis.get(
+					"asset_pack_health_failed",
+					False,
+				),
+				"import_scene_threw": analysis.get("import_scene_threw", False),
+			}
+		)
+		candidates.append(
+			NativeLogObservation(
+				state=state,
+				text=text,
+				analysis=analysis,
+				failure_reason=None,
+			)
+		)
+	prioritizer = native_log_priority if prioritize is None else prioritize
+	selected = (
+		max(candidates, key=lambda item: prioritizer(item.state, item.analysis))
+		if candidates
+		else fallback
+	)
+	if failure_state is not None:
+		final_states = snapshotter(log_directory)
+		final_state = final_states.get(str(failure_state.path.absolute()))
+		if final_state is not None:
+			selected = NativeLogObservation(
+				state=final_state,
+				text=reader(final_state, baseline),
+				analysis=parser(final_state, baseline).to_summary(),
+				failure_reason=None,
+			)
+	if selected is not None:
+		write_text(result_directory / "native.log", selected.text)
+	return NativeLogSelection(observation=selected, captures=tuple(captures))
+
+
+def native_log_priority(
+	state: LogFileState,
+	analysis: Mapping[str, Any],
+) -> tuple[int, int, int, int, str]:
+	"""Rank scene-rich engine logs ahead of newer low-signal logs."""
+
+	scenes = analysis.get("scenes")
+	scene_count = 0
+	if isinstance(scenes, Mapping):
+		for imports in scenes.values():
+			if isinstance(imports, list):
+				scene_count += len(imports)
+	return (
+		int(scene_count > 0),
+		scene_count,
+		int(state.path.name.casefold().startswith("log_")),
+		state.mtime_ns,
+		str(state.path),
+	)
+
+
+def scene_import_survived(
+	analysis: Mapping[str, Any] | None,
+	*,
+	timed_out: bool,
+) -> bool:
+	"""Return whether the target scene completed without a captured failure."""
+
+	if analysis is None:
+		return False
+	return bool(
+		analysis.get("whispering_vale")
+		and not timed_out
+		and not analysis.get("load_texture_to_material_failed", False)
+		and not analysis.get("asset_pack_health_failed", False)
+		and not analysis.get("import_scene_threw", False)
+		and not analysis.get("failed_import_scenes", [])
+	)

src/ptdiag/experiments/models.py

@@ -0,0 +1,18 @@
+"""Stable result and error models for controlled diagnostic experiments."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Any
+
+
+@dataclass(frozen=True)
+class ExperimentResult:
+	result_directory: Path
+	summary: dict[str, Any]
+	exit_code: int
+
+
+class ExperimentError(RuntimeError):
+	"""Raised for a controlled experiment setup or lifecycle failure."""

src/ptdiag/experiments/preparation.py

@@ -0,0 +1,624 @@
+"""Safe testcase preparation for controlled diagnostic experiments."""
+
+from __future__ import annotations
+
+from collections.abc import Callable, Mapping, Sequence
+import json
+import os
+from pathlib import Path, PurePosixPath
+import shutil
+import sys
+from typing import Any
+
+from ..config import AppConfig, project_root
+from ..filesystem import sha256_file
+from ..ini import IniError, inspect_ini_value
+from ..prefix import (
+	PrefixSafetyError,
+	cleanup_dedicated_wineserver,
+	validate_dedicated_prefix,
+)
+from ..registry import DesktopRegistrySnapshot
+from ..result import ResultDirectory
+from ..runner import CommandLogger
+from ..testcase import TestIniOverride, TestModification, Testcase
+from .cleanup import (
+	registry_restore_commands as _registry_restore_commands_impl,
+	registry_setup_commands as _registry_setup_commands_impl,
+	require_command as _require_command,
+	validate_disposable_path as _validate_disposable_path,
+)
+from .models import ExperimentError
+
+
+_WINDOWS_GAME_DIRECTORY = r"C:\Program Files (x86)\Pristontale EU"
+_DISPOSABLE_DIRECTORY_NAME = "ptdiag-disposable"
+_PERSISTENT_STATE_CACHE_SENTINEL = "@ptdiag-persistent"
+_PERSISTENT_STATE_CACHE_DIRECTORY = "ptdiag-cache/dxvk-state"
+
+
+def _resource_copy_paths(
+	live_game: Path,
+	modification: TestModification,
+) -> tuple[Path, Path]:
+	if modification.kind not in {"copy-file", "normalize-assbin-textures"}:
+		raise ExperimentError(f"Unsupported modification kind: {modification.kind}")
+	root = live_game.resolve(strict=True)
+	source_relative = _safe_resource_relative_path(modification.source)
+	destination_relative = _safe_resource_relative_path(modification.destination)
+	source = root.joinpath(*source_relative.parts).resolve(strict=True)
+	try:
+		source.relative_to(root)
+	except ValueError as exc:
+		raise ExperimentError("Modification source escapes the live game tree") from exc
+	if not source.is_file():
+		raise ExperimentError(f"Modification source is not a file: {source}")
+	destination = root.joinpath(*destination_relative.parts)
+	destination_parent = destination.parent.resolve(strict=True)
+	try:
+		destination_parent.relative_to(root)
+	except ValueError as exc:
+		raise ExperimentError("Modification destination escapes the live game tree") from exc
+	if modification.kind == "copy-file" and (destination.exists() or destination.is_symlink()):
+		raise ExperimentError(
+			f"Live modification destination already exists; refusing experiment: {destination}"
+		)
+	if modification.kind == "normalize-assbin-textures":
+		if source_relative != destination_relative:
+			raise ExperimentError(
+				"Assbin normalization source and destination must be the same disposable file"
+			)
+		if not modification.texture_indices:
+			raise ExperimentError("Assbin normalization requires texture_indices")
+		if not destination.is_file():
+			raise ExperimentError(f"Assbin normalization target is not a file: {destination}")
+	return source, destination
+
+
+def _safe_resource_relative_path(value: str) -> PurePosixPath:
+	if "\\" in value:
+		raise ExperimentError("Modification paths must use forward slashes")
+	path = PurePosixPath(value)
+	if path.is_absolute() or not path.parts or any(part in {"", ".", ".."} for part in path.parts):
+		raise ExperimentError(f"Unsafe relative resource path: {value!r}")
+	return path
+
+
+def _prepare_disposable_game(
+	config: AppConfig,
+	result: ResultDirectory,
+	logger: CommandLogger,
+	modification: TestModification,
+	disposable_game: Path,
+	source: Path,
+) -> dict[str, Any]:
+	staging_root = (config.paths.app_root / _DISPOSABLE_DIRECTORY_NAME).absolute()
+	_validate_disposable_path(staging_root, disposable_game, result.path.name)
+	if disposable_game.exists() or disposable_game.is_symlink():
+		raise ExperimentError(f"Disposable game path already exists: {disposable_game}")
+	usage = shutil.disk_usage(staging_root.parent)
+	copy_bytes = _allocated_tree_bytes(config.paths.live_game)
+	if usage.free < copy_bytes + 2 * 1024**3:
+		raise ExperimentError(
+			f"Insufficient free space for disposable game copy: "
+			f"need at least {copy_bytes + 2 * 1024**3}, have {usage.free}"
+		)
+	_require_command(
+		logger.run(
+			["mkdir", "-p", "--", str(staging_root)],
+			timeout_seconds=15.0,
+		),
+		"create disposable staging directory",
+	)
+	_require_command(
+		logger.run(
+			[
+				"cp",
+				"-a",
+				"--reflink=auto",
+				"--sparse=always",
+				f"{config.paths.live_game}/.",
+				str(disposable_game),
+			],
+			timeout_seconds=900.0,
+		),
+		"copy disposable game tree",
+	)
+	destination_relative = _safe_resource_relative_path(modification.destination)
+	destination = disposable_game.joinpath(*destination_relative.parts)
+	if modification.kind == "copy-file":
+		if destination.exists() or destination.is_symlink():
+			raise ExperimentError(
+				f"Disposable destination unexpectedly existed before copy: {destination}"
+			)
+		_require_command(
+			logger.run(
+				["cp", "--preserve=mode,timestamps", "--", str(source), str(destination)],
+				timeout_seconds=30.0,
+			),
+			"copy selected resource",
+		)
+		normalization: dict[str, Any] | None = None
+		destination_existed_before = False
+	elif modification.kind == "normalize-assbin-textures":
+		if not destination.is_file() or destination.is_symlink():
+			raise ExperimentError(
+				f"Disposable Assbin target is missing or unsafe: {destination}"
+			)
+		if sha256_file(destination) != sha256_file(source):
+			raise ExperimentError("Disposable Assbin differs from live source before transform")
+		temporary_output = destination.with_name(
+			f".{destination.name}.{result.path.name}.normalized"
+		)
+		if temporary_output.exists() or temporary_output.is_symlink():
+			raise ExperimentError(f"Normalization temporary output exists: {temporary_output}")
+		normalize_result = logger.run(
+			[
+				sys.executable,
+				"-m",
+				"ptdiag",
+				"scene",
+				"normalize-textures",
+				str(destination),
+				str(temporary_output),
+				*(str(index) for index in modification.texture_indices),
+			],
+			cwd=project_root(),
+			timeout_seconds=240.0,
+		)
+		_require_command(normalize_result, "normalize embedded Assbin textures")
+		try:
+			normalization = json.loads(normalize_result.stdout)
+		except json.JSONDecodeError as exc:
+			raise ExperimentError("Normalizer returned invalid JSON") from exc
+		if not isinstance(normalization, dict) or not normalization.get("ok"):
+			raise ExperimentError("Normalizer did not report a verified result")
+		_require_command(
+			logger.run(
+				["mv", "--", str(temporary_output), str(destination)],
+				timeout_seconds=30.0,
+			),
+			"install normalized Assbin in disposable tree",
+		)
+		destination_existed_before = True
+	else:
+		raise ExperimentError(f"Unsupported modification kind: {modification.kind}")
+	destination_hash = sha256_file(destination)
+	source_hash = sha256_file(source)
+	if modification.kind == "copy-file" and destination_hash != source_hash:
+		raise ExperimentError("Copied resource hash differs from its source")
+	if modification.kind == "normalize-assbin-textures" and destination_hash == source_hash:
+		raise ExperimentError("Normalized Assbin hash did not change")
+	ini_changes = _apply_disposable_ini_overrides(
+		disposable_game,
+		modification.ini_overrides,
+		logger,
+	)
+	return {
+		"staging_root": str(staging_root),
+		"free_bytes_before": usage.free,
+		"source_allocated_bytes": copy_bytes,
+		"destination_path": str(destination),
+		"destination_existed_before": destination_existed_before,
+		"destination_sha256_after": destination_hash,
+		"destination_size_after": destination.stat().st_size,
+		"normalization": normalization,
+		"ini_changes": ini_changes,
+	}
+
+
+def _inspect_ini_overrides(
+	game_root: Path,
+	overrides: Sequence[TestIniOverride],
+) -> list[dict[str, Any]]:
+	root = game_root.resolve(strict=True)
+	result: list[dict[str, Any]] = []
+	for override in overrides:
+		path = _safe_game_file(root, override.path)
+		state = inspect_ini_value(path, override.section, override.key)
+		result.append(
+			{
+				"path": str(path),
+				"section": override.section,
+				"key": override.key,
+				"expected": override.expected,
+				"value": override.value,
+				"current": state["value"],
+				"matches_expected": state["value"] == override.expected,
+				"matches_value": state["value"] == override.value,
+				"sha256": state["sha256"],
+				"size": state["size"],
+				"mtime_ns": state["mtime_ns"],
+			}
+		)
+	return result
+
+
+def _apply_disposable_ini_overrides(
+	disposable_game: Path,
+	overrides: Sequence[TestIniOverride],
+	logger: CommandLogger,
+) -> list[dict[str, Any]]:
+	root = disposable_game.resolve(strict=True)
+	result: list[dict[str, Any]] = []
+	for override in overrides:
+		path = _safe_game_file(root, override.path)
+		outcome = logger.run(
+			_ini_override_command(path, override),
+			cwd=project_root(),
+			timeout_seconds=30.0,
+		)
+		_require_command(outcome, f"override [{override.section}] {override.key}")
+		try:
+			payload = json.loads(outcome.stdout)
+		except json.JSONDecodeError as exc:
+			raise ExperimentError("INI override returned invalid JSON") from exc
+		if not isinstance(payload, dict) or not payload.get("ok"):
+			raise ExperimentError("INI override did not report a verified result")
+		result.append(payload)
+	return result
+
+
+def _safe_game_file(root: Path, relative: str) -> Path:
+	parts = _safe_resource_relative_path(relative).parts
+	path = root.joinpath(*parts)
+	resolved = path.resolve(strict=True)
+	try:
+		resolved.relative_to(root)
+	except ValueError as exc:
+		raise ExperimentError(f"INI path escapes game tree: {relative}") from exc
+	if path.is_symlink() or not resolved.is_file():
+		raise ExperimentError(f"INI path is missing or unsafe: {path}")
+	return resolved
+
+
+def _ini_override_command(path: Path, override: TestIniOverride) -> list[str]:
+	return [
+		sys.executable,
+		"-m",
+		"ptdiag",
+		"ini",
+		"override",
+		str(path),
+		override.section,
+		override.key,
+		override.expected,
+		override.value,
+	]
+
+
+def _allocated_tree_bytes(root: Path) -> int:
+	total = 0
+	for directory, _, filenames in os.walk(root, followlinks=False):
+		for filename in filenames:
+			path = Path(directory) / filename
+			try:
+				total += path.lstat().st_blocks * 512
+			except FileNotFoundError:
+				continue
+	return total
+
+
+def _log_modification_plan(
+	logger: CommandLogger,
+	config: AppConfig,
+	disposable_game: Path,
+	source: Path,
+	modification: TestModification,
+) -> None:
+	staging_root = disposable_game.parent
+	destination = disposable_game.joinpath(
+		*_safe_resource_relative_path(modification.destination).parts
+	)
+	prefix_link = config.proton7.prefix / "drive_c/Program Files (x86)/Pristontale EU"
+	commands: list[tuple[list[str], float]] = [
+		(["mkdir", "-p", "--", str(staging_root)], 15.0),
+		(
+			[
+				"cp",
+				"-a",
+				"--reflink=auto",
+				"--sparse=always",
+				f"{config.paths.live_game}/.",
+				str(disposable_game),
+			],
+			900.0,
+		),
+	]
+	if modification.kind == "copy-file":
+		commands.append(
+			(["cp", "--preserve=mode,timestamps", "--", str(source), str(destination)], 30.0)
+		)
+	elif modification.kind == "normalize-assbin-textures":
+		temporary_output = destination.with_name(f".{destination.name}.planned.normalized")
+		commands.extend(
+			(
+				(
+					[
+						sys.executable,
+						"-m",
+						"ptdiag",
+						"scene",
+						"normalize-textures",
+						str(destination),
+						str(temporary_output),
+						*(str(index) for index in modification.texture_indices),
+					],
+					240.0,
+				),
+				(["mv", "--", str(temporary_output), str(destination)], 30.0),
+			)
+		)
+	else:
+		raise ExperimentError(f"Unsupported modification kind: {modification.kind}")
+	for override in modification.ini_overrides:
+		ini_path = disposable_game.joinpath(
+			*_safe_resource_relative_path(override.path).parts
+		)
+		commands.append((_ini_override_command(ini_path, override), 30.0))
+	commands.extend(
+		(
+			(["ln", "-sfn", "--", str(disposable_game), str(prefix_link)], 15.0),
+			(["ln", "-sfn", "--", os.readlink(prefix_link), str(prefix_link)], 15.0),
+			(["rm", "-rf", "--one-file-system", "--", str(disposable_game)], 900.0),
+		)
+	)
+	for command, timeout in commands:
+		logger.run(command, timeout_seconds=timeout, dry_run=True)
+
+
+def _preflight(
+	config: AppConfig,
+	testcase: Testcase,
+	environment: Mapping[str, Any],
+	hashes: list[dict[str, Any]],
+	*,
+	game_processes: Callable[[], list[int]],
+) -> list[str]:
+	errors: list[str] = []
+	if not environment.get("ok"):
+		errors.append("Required environment checks failed")
+	if any(not item.get("ok", False) for item in hashes if item.get("required", False)):
+		errors.append("A required baseline hash is missing or mismatched")
+	if testcase.runner != "proton7":
+		errors.append(f"Unsupported runner: {testcase.runner}")
+	if testcase.game.args != config.game.args:
+		errors.append("Testcase game arguments differ from the known PTEU_REBORN baseline")
+	if testcase.game.cwd != "live_game":
+		errors.append("Only the verified live_game working directory is supported")
+	if testcase.display.size != config.game.virtual_desktop:
+		errors.append("Testcase desktop size differs from the 1600x900 baseline")
+	if testcase.capture.strace_files and shutil.which("strace") is None:
+		errors.append("scene-strace requires strace")
+	if not testcase.watch.require_new_native_log:
+		errors.append("Runtime tests must require a current-run native log")
+	try:
+		prefix = validate_dedicated_prefix(config)
+	except (OSError, ValueError, PrefixSafetyError) as exc:
+		errors.append(str(exc))
+	else:
+		linked_game = prefix / "drive_c/Program Files (x86)/Pristontale EU"
+		try:
+			if linked_game.resolve(strict=True) != config.paths.live_game.resolve(strict=True):
+				errors.append("Dedicated prefix game link does not resolve to live_game")
+		except OSError as exc:
+			errors.append(f"Dedicated prefix game link is invalid: {exc}")
+	active = game_processes()
+	if active:
+		errors.append(f"Game.exe is already running: {active}")
+	return errors
+
+
+def _dry_run_commands(
+	config: AppConfig,
+	testcase: Testcase,
+	logger: CommandLogger,
+	registry_before: DesktopRegistrySnapshot,
+	launch_argv: list[str],
+	env_overrides: Mapping[str, str],
+) -> None:
+	cleanup_dedicated_wineserver(config, logger, timeout_seconds=15.0, dry_run=True)
+	if testcase.display.virtual_desktop:
+		for command in _registry_setup_commands(
+			config, registry_before.desktop_name, testcase.display.size
+		):
+			logger.run(
+				command,
+				cwd=config.paths.live_game,
+				env_overrides=_proton_environment(config),
+				timeout_seconds=15.0,
+				dry_run=True,
+			)
+	logger.run(
+		launch_argv,
+		cwd=config.paths.live_game,
+		env_overrides=env_overrides,
+		timeout_seconds=testcase.timeout_seconds,
+		dry_run=True,
+	)
+	cleanup_dedicated_wineserver(config, logger, timeout_seconds=15.0, dry_run=True)
+	if testcase.display.virtual_desktop:
+		for command in _registry_restore_commands(config, registry_before):
+			logger.run(
+				command,
+				cwd=config.paths.live_game,
+				env_overrides=_proton_environment(config),
+				timeout_seconds=15.0,
+				dry_run=True,
+			)
+
+
+def _launch_argv(config: AppConfig, testcase: Testcase, result_directory: Path) -> list[str]:
+	game = f"{_WINDOWS_GAME_DIRECTORY}\\{config.game.exe}"
+	proton = _proton_command(config, "runinprefix", game, *testcase.game.args)
+	if not testcase.capture.strace_files:
+		return proton
+	raw_directory = result_directory / "raw-strace"
+	raw_directory.mkdir(exist_ok=False)
+	strace = shutil.which("strace") or "/usr/bin/strace"
+	return [
+		strace,
+		"-ff",
+		"-qq",
+		"-ttt",
+		"-s",
+		"1024",
+		"-e",
+		"trace=%file",
+		"-o",
+		str(raw_directory / "trace"),
+		*proton,
+	]
+
+
+def _proton_command(config: AppConfig, *arguments: str) -> list[str]:
+	shim = project_root() / "ptlinux/proton_compat.py"
+	return [
+		sys.executable,
+		str(shim),
+		str(config.proton7.proton),
+		*arguments,
+	]
+
+
+def _runtime_environment(
+	config: AppConfig,
+	testcase: Testcase,
+	result_directory: Path,
+) -> dict[str, str]:
+	environment = _proton_environment(config)
+	environment.update(testcase.env)
+	if environment.get("DXVK_STATE_CACHE_PATH") == _PERSISTENT_STATE_CACHE_SENTINEL:
+		environment["DXVK_STATE_CACHE_PATH"] = str(
+			(config.paths.app_root / _PERSISTENT_STATE_CACHE_DIRECTORY).absolute()
+		)
+	environment.update(
+		{
+			"DXVK_LOG_PATH": str(result_directory),
+			"PROTON_LOG": "0",
+			"STEAM_COMPAT_INSTALL_PATH": str(config.paths.live_game),
+			"SteamAppId": "0",
+			"SteamGameId": "0",
+		}
+	)
+	return environment
+
+
+def _state_cache_plan(
+	config: AppConfig,
+	environment: Mapping[str, str],
+) -> dict[str, Any] | None:
+	configured = environment.get("DXVK_STATE_CACHE_PATH")
+	if configured is None:
+		return None
+	cache_directory = Path(configured).expanduser().absolute()
+	cache_file = cache_directory / f"{Path(config.game.exe).stem}.dxvk-cache"
+	return {
+		"directory": str(cache_directory),
+		"cache_file": str(cache_file),
+		"persistent": True,
+		"seed_source": str(config.paths.live_game / cache_file.name),
+		"seeded": False,
+		"before": _state_cache_file_snapshot(cache_file),
+		"after": None,
+	}
+
+
+def _prepare_state_cache(
+	config: AppConfig,
+	environment: Mapping[str, str],
+	logger: CommandLogger,
+) -> dict[str, Any]:
+	plan = _state_cache_plan(config, environment)
+	if plan is None:
+		raise ExperimentError("Persistent DXVK state-cache plan is missing")
+	cache_directory = Path(str(plan["directory"]))
+	expected = (config.paths.app_root / _PERSISTENT_STATE_CACHE_DIRECTORY).absolute()
+	if cache_directory != expected:
+		raise ExperimentError(
+			f"Refusing unmanaged DXVK state-cache directory: {cache_directory}; "
+			f"expected {expected}"
+		)
+	_require_command(
+		logger.run(
+			["mkdir", "-p", "--", str(cache_directory)],
+			timeout_seconds=15.0,
+		),
+		"create managed DXVK state-cache directory",
+	)
+	cache_file = Path(str(plan["cache_file"]))
+	seed_source = Path(str(plan["seed_source"]))
+	if not cache_file.exists() and seed_source.is_file():
+		_require_command(
+			logger.run(
+				[
+					"cp",
+					"--preserve=mode,timestamps",
+					"--",
+					str(seed_source),
+					str(cache_file),
+				],
+				timeout_seconds=30.0,
+			),
+			"seed managed DXVK state cache",
+		)
+		plan["seeded"] = True
+	plan["before"] = _state_cache_file_snapshot(cache_file)
+	return plan
+
+
+def _state_cache_file_snapshot(path: Path) -> dict[str, Any]:
+	result: dict[str, Any] = {
+		"path": str(path),
+		"exists": path.is_file(),
+		"size": None,
+		"mtime_ns": None,
+		"sha256": None,
+	}
+	if not result["exists"]:
+		return result
+	try:
+		state = path.stat()
+		result.update(
+			{
+				"size": state.st_size,
+				"mtime_ns": state.st_mtime_ns,
+				"sha256": sha256_file(path),
+			}
+		)
+	except OSError as exc:
+		result["error"] = str(exc)
+	return result
+
+
+def _proton_environment(config: AppConfig) -> dict[str, str]:
+	return {
+		"STEAM_COMPAT_CLIENT_INSTALL_PATH": str(config.proton7.steam_root),
+		"STEAM_COMPAT_DATA_PATH": str(config.proton7.compat),
+		"WINEPREFIX": str(config.proton7.prefix),
+		"WINEDEBUG": "-all",
+	}
+
+
+def _registry_setup_commands(
+	config: AppConfig,
+	desktop_name: str,
+	desktop_size: str,
+) -> list[list[str]]:
+	return _registry_setup_commands_impl(
+		config,
+		desktop_name,
+		desktop_size,
+		proton_command=_proton_command,
+	)
+
+
+def _registry_restore_commands(
+	config: AppConfig,
+	snapshot: DesktopRegistrySnapshot,
+) -> list[list[str]]:
+	return _registry_restore_commands_impl(
+		config,
+		snapshot,
+		proton_command=_proton_command,
+	)

src/ptdiag/logs.py

@@ -0,0 +1,40 @@
+"""Compatibility façade for launcher-owned native game-log parsing."""
+
+from ptlinux.diagnostics.native_logs import (
+	DEFAULT_NATIVE_LOG_PATTERNS,
+	AssetReferenceReport,
+	LogEvent,
+	LogFileState,
+	NativeLogAnalysis,
+	SceneImport,
+	classify_asset_references,
+	discover_current_native_logs,
+	is_current_run_log,
+	newest_current_native_log,
+	normalize_asset_reference,
+	parse_current_run_log,
+	parse_native_log,
+	parse_native_log_lines,
+	read_current_run_log_text,
+	snapshot_native_logs,
+)
+
+
+__all__ = [
+	"DEFAULT_NATIVE_LOG_PATTERNS",
+	"AssetReferenceReport",
+	"LogEvent",
+	"LogFileState",
+	"NativeLogAnalysis",
+	"SceneImport",
+	"classify_asset_references",
+	"discover_current_native_logs",
+	"is_current_run_log",
+	"newest_current_native_log",
+	"normalize_asset_reference",
+	"parse_current_run_log",
+	"parse_native_log",
+	"parse_native_log_lines",
+	"read_current_run_log_text",
+	"snapshot_native_logs",
+]

src/ptdiag/testcase.py

@@ -7,7 +7,12 @@ from pathlib import Path
 from typing import Any, Mapping
 import tomllib
 
-from .config import project_root
+from .config import repository_root
+
+
+DEFAULT_TESTCASE_DIRECTORY = Path("diagnostics/testcases")
+LEGACY_TESTCASE_DIRECTORY = Path("testcases")
+_PATH_ENVIRONMENT_KEYS = frozenset({"DXVK_CONFIG_FILE"})
 
 
 class TestcaseError(ValueError):
@@ -86,7 +91,15 @@ def resolve_testcase_path(value: str | Path) -> Path:
 	path = Path(value)
 	if path.suffix or path.parent != Path("."):
 		return path.expanduser().absolute()
-	return (project_root() / "testcases" / f"{path.name}.toml").absolute()
+	root = repository_root()
+	filename = f"{path.name}.toml"
+	preferred = root / DEFAULT_TESTCASE_DIRECTORY / filename
+	legacy = root / LEGACY_TESTCASE_DIRECTORY / filename
+	if preferred.is_file():
+		return preferred.absolute()
+	if legacy.is_file():
+		return legacy.absolute()
+	return preferred.absolute()
 
 
 def load_testcase(value: str | Path) -> Testcase:
@@ -94,7 +107,10 @@ def load_testcase(value: str | Path) -> Testcase:
 	data, sources = _load_inherited(path, ())
 	game = _section(data, "game")
 	display = _section(data, "display")
-	environment = _section(data, "env")
+	environment = _resolve_environment_paths(
+		_string_mapping(_section(data, "env"), "env"),
+		path.parent,
+	)
 	watch = _section(data, "watch")
 	capture = _section(data, "capture")
 	modification = _optional_section(data, "modification")
@@ -114,7 +130,7 @@ def load_testcase(value: str | Path) -> Testcase:
 			virtual_desktop=_boolean(display, "virtual_desktop"),
 			size=_string(display, "size"),
 		),
-		env=_string_mapping(environment, "env"),
+		env=environment,
 		watch=TestWatch(
 			require_new_native_log=_boolean(watch, "require_new_native_log"),
 		),
@@ -149,6 +165,25 @@ def load_testcase(value: str | Path) -> Testcase:
 	)
 
 
+def _resolve_environment_paths(
+	environment: Mapping[str, str],
+	testcase_directory: Path,
+) -> dict[str, str]:
+	result = dict(environment)
+	for key in _PATH_ENVIRONMENT_KEYS:
+		value = result.get(key)
+		if value is None:
+			continue
+		path = Path(value).expanduser()
+		if path.is_absolute():
+			result[key] = str(path)
+			continue
+		candidate = (testcase_directory / path).resolve(strict=False)
+		if candidate.is_file():
+			result[key] = str(candidate)
+	return result
+
+
 def _load_inherited(
 	path: Path,
 	stack: tuple[Path, ...],

src/ptlinux/application/__init__.py

@@ -0,0 +1,2 @@
+"""Application workflows shared by the CLI and dashboard entry points."""
+

src/ptlinux/application/commands/__init__.py

@@ -0,0 +1,2 @@
+"""Feature-oriented command workflows."""
+

src/ptlinux/application/commands/health.py

@@ -0,0 +1,190 @@
+"""Host health, runtime bootstrap, and login diagnostic commands."""
+
+from __future__ import annotations
+
+from dataclasses import asdict
+import sys
+from typing import Any
+
+from ...container_host import ContainerHostReport
+from ...launcher import LauncherError
+from ...paths import AppPaths
+
+
+def doctor(api: Any, as_json: bool) -> int:
+	report = api.inspect_host()
+	if as_json:
+		api._print_json(report.to_dict())
+	else:
+		print(f"Distribution: {report.distribution} {report.version} ({report.architecture})")
+		print(f"Display:      {report.display_backend}")
+		for tool in report.tools:
+			status = tool.path or "MISSING"
+			required = "required" if tool.required else "optional"
+			print(f"{tool.name:12} {status} [{required}] — {tool.purpose}")
+		optional_missing = [
+			tool.name for tool in report.tools if not tool.required and tool.path is None
+		]
+		if optional_missing:
+			print(
+				"Optional tools missing (these do not block launch): "
+				+ ", ".join(optional_missing)
+			)
+		print(f"Host readiness: {'READY' if report.ok else 'BLOCKED'}")
+		if report.blockers:
+			print("Blocking diagnostics:")
+			for blocker in report.blockers:
+				print(f"  - {blocker}")
+		for warning in report.warnings:
+			print(f"Warning: {warning}")
+		if report.package_hint and any(
+			tool.required and tool.path is None for tool in report.tools
+		):
+			print(report.package_hint)
+	return 0 if report.ok else 1
+
+
+def container_host(api: Any, repair: bool, as_json: bool) -> int:
+	report = api.repair_container_host() if repair else api.inspect_container_host()
+	ok = container_host_ok(report)
+	payload = {"ok": ok, "container_host": report.to_dict()}
+	if as_json:
+		api._print_json(payload)
+	else:
+		status = "ready" if report.ready else "blocked"
+		print(f"Bubblewrap: {status} ({report.bwrap_path or 'not found'})")
+		if report.active_profile_source:
+			print(f"AppArmor:   {report.active_profile_source}")
+		elif report.apparmor_restrict_unprivileged_userns == "1":
+			print(
+				"AppArmor:   unprivileged user namespaces are restricted; "
+				"no bwrap profile found"
+			)
+		if report.repair_actions:
+			for action in report.repair_actions:
+				print(f"Repair:     {action}")
+		if report.repair_error:
+			print(f"Repair failed: {report.repair_error}", file=sys.stderr)
+		elif report.recommendation:
+			print(f"Action: {report.recommendation}", file=sys.stderr)
+	return 0 if ok else 1
+
+
+def container_host_ok(report: ContainerHostReport) -> bool:
+	return (
+		report.ready
+		and not report.broken_umu_profile_link
+		and report.repair_error is None
+	)
+
+
+def container_host_startup_migration(api: Any, paths: AppPaths) -> None:
+	report = api.repair_container_host_after_update(paths)
+	if report.repair_attempted and not container_host_ok(report):
+		print(f"Warning: {api.container_host_error(report)}", file=sys.stderr)
+
+
+def runtime_bootstrap(api: Any, paths: AppPaths, as_json: bool) -> int:
+	api._print_operation_status(as_json, 1, 1, "Preparing the Steam Runtime helper…")
+	result = api.provision_umu(paths)
+	executable = api.find_umu_launcher(paths)
+	if executable is None:
+		raise LauncherError("the Steam Runtime helper is still unavailable")
+	api._emit(
+		{
+			"ok": True,
+			"runtime_bootstrap": {
+				"executable": executable,
+				"managed_download": asdict(result) if result else None,
+			},
+		},
+		as_json,
+	)
+	return 0
+
+
+def login_diagnostics(
+	api: Any,
+	paths: AppPaths,
+	timeout_seconds: float,
+	runtime_choice: str,
+	as_json: bool,
+) -> int:
+	settings = api._load_or_default_settings(paths, persist=False)
+	runner = api._runner(paths, "login-diagnostics", False)
+	with api._operation_guard(paths, "login-diagnostics", False):
+		report = api.inspect_login_environment(
+			paths,
+			settings,
+			timeout_seconds=timeout_seconds,
+			runner=runner,
+			runtime_override=(
+				None if runtime_choice == "configured" else runtime_choice
+			),
+		)
+	if as_json:
+		api._print_json(report.to_dict())
+	else:
+		probe = report.login_server
+		print(f"Launcher:      {report.launcher_version} ({report.launcher_module})")
+		print(f"Python:        {report.python_executable}")
+		print(f"Host:          {report.distribution_id} ({report.kernel_release})")
+		print(
+			"Runtime test:  "
+			f"{report.runtime_requested} "
+			f"(configured: {report.runtime_configured}; settings unchanged)"
+		)
+		status = "REACHABLE" if probe.reachable else "UNREACHABLE"
+		latency = f", {probe.latency_ms:.1f} ms" if probe.latency_ms is not None else ""
+		print(f"Login server:  {status} ({probe.host}:{probe.port}{latency})")
+		if probe.error:
+			print(f"Network error: {probe.error}")
+		print("Authentication: not tested; no credentials or game-protocol data were sent")
+		print(f"Login responses: {report.login_response_ownership}")
+		identity_status = (
+			"ready"
+			if report.client_identity_ready is True
+			else "NOT READY"
+			if report.client_identity_ready is False
+			else "not probed"
+		)
+		print(f"Client identity: {identity_status}; raw identity values were not collected")
+		print(f"Privacy:       {report.client_identity_privacy}")
+		if not report.login_trace_enabled:
+			print("Login trace:    retired (will not launch or instrument the game)")
+		print(f"Publisher test: {report.publisher_comparison_command}")
+		print(f"Game profile:  {report.game_profile}")
+		print(f"Game.exe:      {report.game_exe}")
+		if report.game_exe_sha256:
+			print(f"Game SHA-256:  {report.game_exe_sha256}")
+		print(f"game.dll:      {report.game_dll}")
+		if report.game_dll_sha256:
+			print(f"DLL SHA-256:   {report.game_dll_sha256}")
+		print(
+			"Managed source: "
+			+ ("matches runtime" if report.runtime_matches_managed_source else "DIFFERS")
+		)
+		if report.depot_build is not None:
+			print(
+				f"Depot:         build {report.depot_build} "
+				f"({report.depot_version or 'unknown version'})"
+			)
+		if report.runtime_kind:
+			print(f"Runtime:       {report.runtime_kind} ({report.runtime_path or 'unknown path'})")
+		else:
+			print(f"Runtime:       unavailable ({report.runtime_error or 'selection failed'})")
+		if report.proton_sync_effective is not None:
+			print(
+				"Proton sync:   "
+				f"{report.proton_sync_configured} -> {report.proton_sync_effective}"
+			)
+		prefix_status = "ready" if report.prefix_ready else "not ready"
+		directx_status = "ready" if report.directx_ready else "not ready"
+		print(f"Prefix:        {prefix_status}; DirectX helpers {directx_status}")
+		print(f"Prefix path:   {report.prefix or 'unavailable'}")
+		print(f"Latest log:    {report.latest_game_log or 'not found'}")
+		if report.latest_game_log_modified_at:
+			print(f"Log modified:  {report.latest_game_log_modified_at}")
+		for warning in report.warnings:
+			print(f"Warning: {warning}")
+	return 0 if report.preflight_ok else 1

src/ptlinux/application/commands/installation.py

@@ -0,0 +1,479 @@
+"""Download, setup, depot synchronization, import, and prepare commands."""
+
+from __future__ import annotations
+
+from dataclasses import asdict
+import json
+from pathlib import Path
+import time
+from typing import Any
+
+from ...command import CommandOutcome, CommandRunner
+from ...depot import DownloadOptions, SyncProgress
+from ...importer import GameImportResult
+from ...launcher import LauncherError, WineTools
+from ...paths import AppPaths
+from ...settings import Settings
+
+
+def fetch(api: Any, paths: AppPaths, dry_run: bool, as_json: bool) -> int:
+	if not dry_run:
+		paths.create_base_directories()
+	if dry_run:
+		value = {
+			"ok": True,
+			"dry_run": True,
+			"url": api.OFFICIAL_LAUNCHER_URL,
+			"download": str(paths.launcher_pristine),
+			"prepared": str(paths.launcher_patched),
+		}
+	else:
+		telemetry = api.current_telemetry()
+		download_started_at = time.monotonic()
+		if telemetry is not None:
+			telemetry.send_event(
+				"download_started",
+				metadata={
+					"resource_type": "launcher",
+					"mirror_id": "pristontale.eu",
+				},
+				context={"operation": "download", "stage": "launcher_download"},
+			)
+		try:
+			download = api.fetch_official_launcher(
+				paths.launcher_pristine,
+				paths.launcher_metadata,
+			)
+		except BaseException as exc:
+			if telemetry is not None:
+				telemetry.send_event(
+					"download_failed",
+					severity="error",
+					message=str(exc),
+					metadata={
+						"resource_type": "launcher",
+						"duration_ms": round(
+							(time.monotonic() - download_started_at) * 1000
+						),
+						"failure_type": api.classify_network_failure(exc),
+						"http_status": api.network_http_status(exc),
+						"mirror_id": "pristontale.eu",
+					},
+					context={"operation": "download", "stage": "launcher_download"},
+				)
+			raise
+		download_duration = max(0.0, time.monotonic() - download_started_at)
+		download_bytes = download.size if download.changed else 0
+		if telemetry is not None:
+			telemetry.send_event(
+				"download_completed",
+				metadata={
+					"resource_type": "launcher",
+					"download_bytes": download_bytes,
+					"content_bytes": download.size,
+					"duration_ms": round(download_duration * 1000),
+					"average_mbps": (
+						round((download_bytes * 8) / download_duration / 1_000_000, 3)
+						if download_bytes and download_duration > 0
+						else None
+					),
+					"retry_count": 0,
+					"resume_used": False,
+					"http_status": 200 if download.changed else 304,
+					"changed": download.changed,
+					"mirror_id": "pristontale.eu",
+				},
+				context={"operation": "download", "stage": "launcher_download"},
+			)
+		validation_started_at = time.monotonic()
+		try:
+			patch = api.prepare_launcher_binary(
+				paths.launcher_pristine,
+				paths.launcher_patched,
+			)
+		except BaseException as exc:
+			if telemetry is not None:
+				telemetry.send_event(
+					"file_validation_failed",
+					severity="error",
+					message=str(exc),
+					metadata={
+						"file_category": "launcher",
+						"duration_ms": round(
+							(time.monotonic() - validation_started_at) * 1000
+						),
+					},
+					context={"operation": "download", "stage": "validation"},
+				)
+			raise
+		value = {
+			"ok": True,
+			"download": asdict(download),
+			"patch": asdict(patch),
+			"warning": None if patch.supported_profile else (
+				"The launcher is newer than the verified font-patch profile; "
+				"it was retained byte-for-byte."
+			),
+		}
+	api._emit(value, as_json)
+	return 0
+
+
+def setup(
+	api: Any,
+	paths: AppPaths,
+	dry_run: bool,
+	force_runtime: bool,
+	as_json: bool,
+) -> int:
+	tools = api.find_wine_tools()
+	if tools is None:
+		raise LauncherError("Wine, Wineboot, and Winetricks are required; run doctor")
+	runner = api._runner(paths, "setup", dry_run)
+	with api._operation_guard(paths, "setup", dry_run):
+		results = api._configure_launcher_runtime(
+			paths,
+			tools,
+			runner,
+			force_runtime=force_runtime,
+		)
+	api._emit(
+		{
+			"ok": True,
+			"dry_run": dry_run,
+			"prefix": str(paths.launcher_prefix),
+			"commands": [asdict(result) for result in results],
+		},
+		as_json,
+	)
+	return 0
+
+
+def native_update(
+	api: Any,
+	paths: AppPaths,
+	dry_run: bool,
+	repair: bool,
+	seed_from: Path | None,
+	no_import: bool,
+	as_json: bool,
+) -> int:
+	"""Use the native verified depot client for normal installs and updates."""
+
+	settings = api._load_or_default_settings(paths, persist=not dry_run)
+	download_options = api._configured_download_options(settings)
+	runner = api._runner(paths, "native-update", dry_run)
+	with api._operation_guard(paths, "native-update", dry_run):
+		api._print_operation_status(as_json, 1, 3, "Checking local game files…")
+		game_import = None
+		if not no_import:
+			game_import = api._maybe_import_game(
+				paths,
+				settings,
+				seed_from,
+				runner,
+				announce=not as_json,
+			)
+		verify_import = game_import is not None or api.game_import_requires_verification(paths)
+		api._print_operation_status(as_json, 2, 3, "Synchronizing official game files…")
+		result = api.sync_managed_game(
+			paths,
+			repair=repair or verify_import,
+			quarantine_unmanaged=verify_import,
+			dry_run=dry_run,
+			progress=None if as_json else api._print_sync_progress,
+			**(
+				{"download_options": download_options}
+				if download_options is not None
+				else {}
+			),
+		)
+		if verify_import and not dry_run:
+			api.mark_game_import_verified(
+				paths,
+				build=result.build,
+				files_quarantined=result.files_quarantined,
+				quarantine_directory=result.quarantine_directory,
+			)
+		overlay = None
+		if not dry_run and paths.source_game.is_dir():
+			api._print_operation_status(as_json, 3, 3, "Preparing the clean game runtime view…")
+			overlay = asdict(api.prepare_runtime_view(paths, paths.source_game))
+	api._emit(
+		{
+			"ok": True,
+			"dry_run": dry_run,
+			"game_import": asdict(game_import) if game_import else None,
+			"native_update": asdict(result),
+			"runtime_view": overlay,
+		},
+		as_json,
+	)
+	return 0
+
+
+def wine_update(
+	api: Any,
+	paths: AppPaths,
+	dry_run: bool,
+	force_runtime: bool,
+	seed_from: Path | None,
+	no_import: bool,
+	as_json: bool,
+) -> int:
+	api._fetch(paths, dry_run, True)
+	tools = api.find_wine_tools()
+	if tools is None:
+		raise LauncherError("Wine, Wineboot, and Winetricks are required; run doctor")
+	runner = api._runner(paths, "update", dry_run)
+	settings = api._load_or_default_settings(paths, persist=not dry_run)
+	download_options = api._configured_download_options(settings)
+	with api._operation_guard(paths, "update", dry_run):
+		api._configure_launcher_runtime(
+			paths,
+			tools,
+			runner,
+			force_runtime=force_runtime,
+		)
+		game_import = None
+		if not no_import:
+			game_import = api._maybe_import_game(
+				paths,
+				settings,
+				seed_from,
+				runner,
+				announce=not as_json,
+			)
+		updater = api.launch_official_updater(paths, tools, runner)
+		native_verification = None
+		verify_import = not dry_run and (
+			game_import is not None or api.game_import_requires_verification(paths)
+		)
+		if verify_import:
+			native_verification = api.sync_managed_game(
+				paths,
+				repair=True,
+				quarantine_unmanaged=True,
+				progress=None if as_json else api._print_sync_progress,
+				**(
+					{"download_options": download_options}
+					if download_options is not None
+					else {}
+				),
+			)
+			api.mark_game_import_verified(
+				paths,
+				build=native_verification.build,
+				files_quarantined=native_verification.files_quarantined,
+				quarantine_directory=native_verification.quarantine_directory,
+			)
+		overlay = None
+		if not dry_run and paths.source_game.is_dir():
+			overlay = asdict(api.prepare_runtime_view(paths, paths.source_game))
+	value = {
+		"ok": True,
+		"dry_run": dry_run,
+		"game_import": asdict(game_import) if game_import else None,
+		"updater": asdict(updater),
+		"native_verification": (
+			asdict(native_verification) if native_verification is not None else None
+		),
+		"runtime_view": overlay,
+	}
+	api._emit(value, as_json)
+	return 0
+
+
+def configure_launcher_runtime(
+	api: Any,
+	paths: AppPaths,
+	tools: WineTools,
+	runner: CommandRunner,
+	*,
+	force_runtime: bool,
+) -> list[CommandOutcome]:
+	if not force_runtime or runner.dry_run:
+		return api.configure_launcher_prefix(
+			paths,
+			tools,
+			runner,
+			force_runtime=force_runtime,
+		)
+	telemetry = api.current_telemetry()
+	started_at = time.monotonic()
+	metadata = {
+		"runtime_type": "dotnet_desktop",
+		"runtime_version": "6",
+	}
+	if telemetry is not None:
+		telemetry.send_event(
+			"runtime_reinstall_requested",
+			metadata={**metadata, "reason": "force_runtime"},
+			context={"operation": "runtime_repair", "stage": "requested"},
+		)
+		telemetry.send_event(
+			"runtime_repair_started",
+			metadata=metadata,
+			context={"operation": "runtime_repair", "stage": "started"},
+		)
+	try:
+		results = api.configure_launcher_prefix(
+			paths,
+			tools,
+			runner,
+			force_runtime=True,
+		)
+	except BaseException as exc:
+		if telemetry is not None:
+			telemetry.send_event(
+				"runtime_repair_failed",
+				severity="error",
+				message=str(exc),
+				metadata={
+					**metadata,
+					"duration_ms": round((time.monotonic() - started_at) * 1000),
+				},
+				context={"operation": "runtime_repair", "stage": "runtime_install"},
+			)
+		raise
+	if telemetry is not None:
+		telemetry.send_event(
+			"runtime_repair_success",
+			metadata={
+				**metadata,
+				"duration_ms": round((time.monotonic() - started_at) * 1000),
+			},
+			context={"operation": "runtime_repair", "stage": "completed"},
+		)
+	return results
+
+
+def print_sync_progress(progress: SyncProgress) -> None:
+	"""Emit line-delimited progress that the native Tk dashboard can consume."""
+
+	print(f"PROGRESS {json.dumps(asdict(progress), sort_keys=True)}", flush=True)
+
+
+def configured_download_options(settings: Settings) -> DownloadOptions | None:
+	if (
+		settings.download_speed_limit_bytes_per_second is None
+		and not settings.low_bandwidth_mode
+	):
+		return None
+	return DownloadOptions(
+		bandwidth_limit_bytes_per_second=(
+			settings.download_speed_limit_bytes_per_second
+		),
+		low_bandwidth=settings.low_bandwidth_mode,
+	)
+
+
+def print_operation_status(
+	as_json: bool,
+	step: int,
+	total: int,
+	message: str,
+) -> None:
+	"""Emit a structured operation stage for the native launcher dashboard."""
+
+	if not as_json:
+		print(
+			f"STATUS {json.dumps({'step': step, 'total': total, 'message': message})}",
+			flush=True,
+		)
+
+
+def import_game(
+	api: Any,
+	paths: AppPaths,
+	source: Path,
+	dry_run: bool,
+	as_json: bool,
+) -> int:
+	runner = api._runner(paths, "import-game", dry_run)
+	if not as_json:
+		print(f"Importing existing game from {source.expanduser()}…", flush=True)
+	with api._operation_guard(paths, "import-game", dry_run):
+		result = api._import_with_telemetry(paths, source, runner)
+	api._emit({"ok": True, "dry_run": dry_run, "game_import": asdict(result)}, as_json)
+	return 0
+
+
+def maybe_import_game(
+	api: Any,
+	paths: AppPaths,
+	settings: Settings,
+	seed_from: Path | None,
+	runner: CommandRunner,
+	*,
+	announce: bool,
+) -> GameImportResult | None:
+	if paths.source_game.exists() or paths.source_game.is_symlink():
+		if seed_from is not None:
+			raise RuntimeError(
+				f"cannot seed an existing managed game directory: {paths.source_game}"
+			)
+		return None
+	candidate = seed_from
+	if candidate is None:
+		candidate = api.discover_existing_game(paths, settings)
+	if candidate is None:
+		return None
+	if announce:
+		print(f"Bootstrapping from existing game: {candidate}", flush=True)
+	return api._import_with_telemetry(paths, candidate, runner)
+
+
+def import_with_telemetry(
+	api: Any,
+	paths: AppPaths,
+	source: Path,
+	runner: CommandRunner,
+) -> GameImportResult:
+	telemetry = api.current_telemetry()
+	started_at = time.monotonic()
+	if telemetry is not None and not runner.dry_run:
+		telemetry.send_event(
+			"import_started",
+			context={"operation": "import", "stage": "copy"},
+		)
+	try:
+		result = api.import_existing_game(paths, source, runner)
+	except BaseException as exc:
+		if telemetry is not None and not runner.dry_run:
+			telemetry.send_event(
+				"import_failed",
+				severity="error",
+				message=str(exc),
+				metadata={
+					"duration_ms": round((time.monotonic() - started_at) * 1000),
+				},
+				context={"operation": "import", "stage": "copy"},
+			)
+		raise
+	if telemetry is not None and not runner.dry_run:
+		telemetry.send_event(
+			"import_success",
+			metadata={
+				"files_imported": result.files,
+				"bytes_imported": result.bytes,
+				"duration_ms": round((time.monotonic() - started_at) * 1000),
+			},
+			context={"operation": "import", "stage": "completed"},
+		)
+	return result
+
+
+def prepare(api: Any, paths: AppPaths, game_dir: Path | None, as_json: bool) -> int:
+	with api._operation_guard(paths, "prepare", False):
+		if game_dir is None and api.game_import_requires_verification(paths):
+			raise LauncherError(
+				"the imported game has not completed its full publisher verification; "
+				"run pristontale-eu update"
+			)
+		settings = api.ensure_settings(paths)
+		source = api._source_game(paths, settings, game_dir)
+		result = api.prepare_runtime_view(paths, source)
+	api._emit({"ok": True, "runtime_view": asdict(result)}, as_json)
+	return 0
+

src/ptlinux/application/commands/launcher_update.py

@@ -0,0 +1,138 @@
+"""Launcher self-update command workflow."""
+
+from __future__ import annotations
+
+from dataclasses import asdict
+from pathlib import Path
+import sys
+from typing import Any
+
+from ...paths import AppPaths
+from ...umu import UmuBootstrapResult
+from ...update_resolver import STABLE_CHANNEL
+
+
+def launcher_update(
+	api: Any,
+	paths: AppPaths,
+	check_only: bool,
+	verify: bool,
+	rollback: str | bool | None,
+	manifest_url: str | None,
+	public_key: Path | None,
+	as_json: bool,
+	*,
+	history_url: str | None = None,
+) -> int:
+	try:
+		selected_channel = api.load_settings(paths).update_channel
+	except (OSError, TypeError, ValueError):
+		# Keep update recovery usable when settings are absent or damaged.
+		selected_channel = STABLE_CHANNEL
+	rollback_requested = rollback is not None and rollback is not False
+	if rollback_requested:
+		target_version = rollback if isinstance(rollback, str) and rollback else None
+		result = api.rollback_launcher_update(
+			paths,
+			target_version=target_version,
+			selected_channel=selected_channel,
+			history_url=history_url,
+			public_key_path=public_key,
+		)
+		api._emit(
+			{
+				"ok": True,
+				"launcher_rollback": asdict(result),
+			},
+			as_json,
+		)
+		return 0
+	if check_only:
+		check = api.check_for_launcher_update(
+			manifest_url=manifest_url,
+			public_key_path=public_key,
+			channel=selected_channel,
+		)
+		api._emit(
+			{
+				"ok": True,
+				"launcher_update": api.update_check_to_dict(check),
+			},
+			as_json,
+		)
+		return 0
+	if verify:
+		api._print_operation_status(as_json, 1, 2, "Authenticating the launcher release…")
+		result = api.verify_launcher_update_channel(
+			manifest_url=manifest_url,
+			public_key_path=public_key,
+			channel=selected_channel,
+		)
+		api._print_operation_status(as_json, 2, 2, "Published launcher release verified.")
+		api._emit(
+			{
+				"ok": True,
+				"launcher_update_verification": asdict(result),
+			},
+			as_json,
+		)
+		return 0
+	api._print_operation_status(as_json, 1, 4, "Verifying the signed launcher release…")
+	result = api.install_launcher_update(
+		paths,
+		manifest_url=manifest_url,
+		public_key_path=public_key,
+		channel=selected_channel,
+	)
+	api._print_operation_status(
+		as_json,
+		2,
+		4,
+		"Launcher update installed; preparing the Steam Runtime helper…",
+	)
+	umu_result: UmuBootstrapResult | None = None
+	umu_executable: str | None = None
+	umu_warning: str | None = None
+	try:
+		umu_result = api.provision_umu(paths)
+		umu_executable = api.find_umu_launcher(paths)
+	except (OSError, RuntimeError) as exc:
+		# Activation is already durable. Keep the update successful so the GUI can
+		# restart into the new release, whose startup hook and Play path both retry.
+		warning_message = (
+			"the launcher update was installed, but the Steam Runtime helper could "
+			f"not be prepared yet: {exc}"
+		)
+		umu_warning = warning_message
+		if not as_json:
+			print(f"Warning: {warning_message}", file=sys.stderr)
+	api._print_operation_status(
+		as_json,
+		3,
+		4,
+		"Checking Steam Runtime sandbox permissions (authentication may be requested)…",
+	)
+	container_report = api.repair_container_host()
+	container_warning = container_report.repair_error
+	if not container_report.ready and container_warning is None:
+		container_warning = container_report.recommendation
+	if container_warning and not as_json:
+		print(f"Warning: {container_warning}", file=sys.stderr)
+	api._print_operation_status(as_json, 4, 4, "Launcher update and runtime check complete.")
+	api._emit(
+		{
+			"ok": True,
+			"launcher_update": asdict(result),
+			"runtime_bootstrap": {
+				"executable": umu_executable,
+				"managed_download": asdict(umu_result) if umu_result else None,
+				"warning": umu_warning,
+			},
+			"container_host": {
+				**container_report.to_dict(),
+				"warning": container_warning,
+			},
+		},
+		as_json,
+	)
+	return 0

src/ptlinux/application/commands/play.py

@@ -0,0 +1,938 @@
+"""Game launch, runtime outcome, log, and crash reporting commands."""
+
+from __future__ import annotations
+
+from collections.abc import Callable, Sequence
+from dataclasses import asdict, replace
+from datetime import datetime
+from pathlib import Path
+import re
+import signal
+import sys
+import threading
+import time
+from typing import Any
+from uuid import uuid4
+
+from ...command import CommandOutcome
+from ...diagnostics.native_logs import LogFileState
+from ...game.runtime import RuntimeErrorPT, runtime_settings_for_realm
+from ...launcher import LauncherError
+from ...login_trace import LOGIN_TRACE_DISABLED_REASON
+from ...paths import AppPaths
+from ...settings import Settings
+from ...umu import UmuBootstrapResult
+from ...window_diagnostics import (
+	WINDOW_DIAGNOSTICS_ENV,
+	WINDOW_DIAGNOSTICS_SESSION_ENV,
+)
+
+
+def play(
+	api: Any,
+	paths: AppPaths,
+	game_dir: Path | None,
+	no_box: bool,
+	dry_run: bool,
+	skip_runtime_setup: bool,
+	as_json: bool,
+	*,
+	realm: str | None = None,
+) -> int:
+	with api._play_guard(paths, dry_run) as play_lease:
+		return api._play_locked(
+			paths,
+			game_dir,
+			no_box,
+			dry_run,
+			skip_runtime_setup,
+			as_json,
+			realm=realm,
+			reuse_prepared=not play_lease.preparation_allowed,
+			before_game=play_lease.allow_shared_clients,
+			game_lease_fds=play_lease.inherited_fds,
+		)
+
+
+def play_locked(
+	api: Any,
+	paths: AppPaths,
+	game_dir: Path | None,
+	no_box: bool,
+	dry_run: bool,
+	skip_runtime_setup: bool,
+	as_json: bool,
+	*,
+	realm: str | None = None,
+	reuse_prepared: bool = False,
+	before_game: Callable[[], None] | None = None,
+	game_lease_fds: Sequence[int] = (),
+) -> int:
+	telemetry = api.current_telemetry()
+	launch_requested_at = time.monotonic()
+	window_diagnostics_active = (
+		telemetry is not None
+		and not dry_run
+		and bool(getattr(telemetry, "enabled", True))
+	)
+	launch_session_id = uuid4().hex if window_diagnostics_active else None
+	launch_session_metadata = (
+		{"launch_session_id": launch_session_id}
+		if launch_session_id is not None
+		else {}
+	)
+	if telemetry is not None and not dry_run:
+		telemetry.send_event(
+			"game_launch_requested",
+			metadata=launch_session_metadata,
+			context={"operation": "launch_game", "stage": "preflight"},
+		)
+	if game_dir is None and api.game_import_requires_verification(paths):
+		raise LauncherError(
+			"the imported game has not completed its full publisher verification; "
+			"run pristontale-eu update before playing"
+		)
+	settings = api._load_or_default_settings(paths, persist=not dry_run)
+	launcher_nested_in_steam_runtime = api.is_running_inside_steam_runtime()
+	if launcher_nested_in_steam_runtime and not dry_run:
+		print(
+			"Warning: the launcher itself is running inside Steam Runtime. Start "
+			"it from the desktop menu or a host terminal; nesting its UMU runtime "
+			"can cause black game output.",
+			file=sys.stderr,
+			flush=True,
+		)
+	window_launch_metadata: dict[str, object] = {
+		"gamebox_enabled": not no_box,
+		"resizable_window_requested": settings.allow_window_resizing,
+		"launcher_inside_steam_runtime": launcher_nested_in_steam_runtime,
+	}
+	if (
+		launcher_nested_in_steam_runtime
+		and settings.allow_window_resizing
+		and not no_box
+	):
+		window_launch_metadata["gamescope_disabled_reason"] = (
+			"launcher_inside_steam_runtime"
+		)
+	start_option = api.select_depot_start_option(
+		api.read_cached_depot_launch_catalog(paths.depot_launch_catalog_cache),
+		realm or settings.realm,
+	)
+	settings = runtime_settings_for_realm(settings, start_option.name)
+	source = api._source_game(paths, settings, game_dir)
+	overlay = None
+	depot_file_catalog = None
+	depot_preflight = None
+	if game_dir is None and not dry_run:
+		depot_file_catalog = api.read_current_depot_file_catalog(paths)
+	api._print_operation_status(
+		as_json,
+		1,
+		4,
+		(
+			"Reusing the active managed game view…"
+			if reuse_prepared
+			else "Preparing the managed game view…"
+		),
+	)
+	if reuse_prepared:
+		if game_dir is not None:
+			raise LauncherError(
+				"an additional client cannot replace the active managed game view; "
+				"close every client before using --game-dir"
+			)
+		if not paths.runtime_view.is_dir():
+			raise LauncherError(
+				"another game client is active, but the prepared runtime view is missing"
+			)
+	elif not dry_run:
+		if game_dir is None:
+			if depot_file_catalog is not None:
+				depot_preflight = api.preflight_managed_game(
+					paths,
+					catalog=depot_file_catalog,
+				)
+				if depot_preflight is not None and not depot_preflight.ready:
+					details = "; ".join(
+						f"{issue.path}: {issue.reason}"
+						for issue in depot_preflight.issues[:3]
+					)
+					raise LauncherError(
+						"the managed game integrity check found "
+						f"{depot_preflight.issue_count} missing or changed file(s)"
+						+ (f" ({details})" if details else "")
+						+ "; run `pristontale-eu update --repair` before playing"
+					)
+		overlay = api.prepare_runtime_view(paths, source)
+	api._print_operation_status(as_json, 2, 4, "Ensuring the compatibility runtime is available…")
+	umu_bootstrap = (
+		None
+		if reuse_prepared
+		else api._ensure_portable_umu_for_play(paths, settings, dry_run=dry_run)
+	)
+	selection = api.select_runtime(settings, paths=paths)
+	runner = api._runner(paths, "play", dry_run)
+	setup_results = []
+	if reuse_prepared:
+		api._print_operation_status(
+			as_json,
+			3,
+			4,
+			"Reusing the active Proton and DirectX runtime…",
+		)
+		if not api.game_runtime_ready(paths, selection):
+			raise LauncherError(
+				"another game client is active, but its prepared runtime no longer "
+				"matches the current settings; close every client and launch again"
+			)
+	elif not skip_runtime_setup:
+		api._print_operation_status(as_json, 3, 4, "Preparing Proton and DirectX components…")
+		setup_results = api.prepare_game_runtime(paths, selection, runner)
+	else:
+		api._print_operation_status(as_json, 3, 4, "Using the existing Proton runtime…")
+	api._print_operation_status(as_json, 4, 4, "Starting the PristonTale game client…")
+	native_log_directory = paths.game_save / "logs"
+	native_log_baseline = api.snapshot_native_logs(
+		native_log_directory,
+		patterns=("log_*.txt",),
+	)
+	crash_directory = paths.game_save / "crash"
+	crash_baseline = api.snapshot_native_logs(
+		crash_directory,
+		patterns=("*.dat", "*.dmp"),
+	)
+	game_started_ns = time.time_ns()
+	game_started_at = time.monotonic()
+	launch_success_lock = threading.Lock()
+	# CommandRunner keeps a bounded output tail. Preserve readiness here so a
+	# long, noisy session cannot evict the evidence and become a false failure.
+	observed_readiness_signal: str | None = None
+	launch_success_reported = False
+	reported_runtime_warnings: set[str] = set()
+	if telemetry is not None and not dry_run:
+		telemetry.send_event(
+			"game_launch_started",
+			metadata={
+				**launch_session_metadata,
+				**window_launch_metadata,
+				"launch_duration_ms": round(
+					(game_started_at - launch_requested_at) * 1000
+				),
+				"launch_stage": "game_start",
+				"runtime": selection.kind,
+				"realm": start_option.name,
+			},
+			context={"operation": "launch_game", "stage": "game_start"},
+		)
+	if before_game is not None:
+		before_game()
+	managed_asset_paths = (
+		[entry.path for entry in depot_file_catalog.files]
+		if depot_file_catalog is not None
+		else None
+	)
+
+	def observe_game_output(line: str) -> str | None:
+		"""Timestamp launch success when the supervisor first confirms readiness."""
+
+		nonlocal observed_readiness_signal, launch_success_reported
+		presentation_failure = api._gamescope_presentation_failure(line)
+		if telemetry is not None and not dry_run and presentation_failure is not None:
+			with launch_success_lock:
+				if presentation_failure not in reported_runtime_warnings:
+					reported_runtime_warnings.add(presentation_failure)
+					telemetry.send_event(
+						"game_window_diagnostic",
+						severity="warning",
+						metadata={
+							**launch_session_metadata,
+							**window_launch_metadata,
+							"component": "gamescope_host",
+							"diagnostic": presentation_failure,
+							"runtime": selection.kind,
+							"realm": start_option.name,
+						},
+						context={
+							"operation": "launch_game",
+							"stage": "presentation",
+						},
+					)
+		window_diagnostic = api.parse_window_diagnostic(line)
+		if window_diagnostic is not None:
+			diagnostic_session_id = window_diagnostic.get("session_id")
+			if launch_session_id is None or diagnostic_session_id != launch_session_id:
+				return line
+			if telemetry is not None and window_diagnostics_active:
+				with launch_success_lock:
+					telemetry.send_event(
+						"game_window_diagnostic",
+						severity=api._window_diagnostic_severity(window_diagnostic),
+						metadata={
+							"runtime": selection.kind,
+							"realm": start_option.name,
+							**window_diagnostic,
+						},
+						context={
+							"operation": "launch_game",
+							"stage": "window_diagnostics",
+						},
+					)
+			return None
+		live_readiness_signal = api._game_readiness_signal(line)
+		if live_readiness_signal is None:
+			return line
+		with launch_success_lock:
+			if observed_readiness_signal is None:
+				observed_readiness_signal = live_readiness_signal
+			if telemetry is None or dry_run or launch_success_reported:
+				return line
+			ready_at = time.monotonic()
+			launch_success_reported = telemetry.send_event(
+				"game_launch_success",
+				metadata={
+					**launch_session_metadata,
+					**window_launch_metadata,
+					"launch_duration_ms": round(
+						(ready_at - launch_requested_at) * 1000
+					),
+					"game_start_duration_ms": round(
+						(ready_at - game_started_at) * 1000
+					),
+					"game_window_ready": True,
+					"readiness_signal": observed_readiness_signal,
+					"runtime": selection.kind,
+					"realm": start_option.name,
+				},
+				context={"operation": "launch_game", "stage": "ready"},
+			)
+		return line
+
+	try:
+		outcome = api.run_game(
+			paths,
+			settings,
+			selection,
+			runner,
+			start_option=start_option,
+			use_gamebox=not no_box,
+			concurrent_prefix_launch=reuse_prepared,
+			check=False,
+			output_line_filter=observe_game_output,
+			extra_environment=(
+				{
+					WINDOW_DIAGNOSTICS_ENV: "1",
+					WINDOW_DIAGNOSTICS_SESSION_ENV: launch_session_id,
+				}
+				if launch_session_id is not None
+				else None
+			),
+			pass_fds=game_lease_fds,
+		)
+	except KeyboardInterrupt:
+		game_runtime_seconds = max(0.0, time.monotonic() - game_started_at)
+		current_game_log = api._current_game_log(
+			native_log_directory,
+			native_log_baseline,
+			game_started_ns,
+			managed_asset_paths=managed_asset_paths,
+			source_game=source if managed_asset_paths is not None else None,
+		)
+		launch_evidence = observed_readiness_signal
+		if launch_evidence is None and current_game_log is not None:
+			launch_evidence = "game_log"
+		if telemetry is not None and not dry_run:
+			api._report_game_launch_cancelled(
+				telemetry,
+				launch_requested_at,
+				stage="running" if launch_evidence is not None else "game_start",
+				metadata={
+					**launch_session_metadata,
+					**window_launch_metadata,
+					"runtime_seconds": round(game_runtime_seconds),
+					"clean_exit": False,
+					"launch_succeeded": launch_evidence is not None,
+					"game_window_ready": observed_readiness_signal is not None,
+					"readiness_signal": launch_evidence,
+					"session_duration_class": api._session_duration_class(
+						game_runtime_seconds
+					),
+					"runtime": selection.kind,
+					"realm": start_option.name,
+				},
+			)
+		if current_game_log is not None and not as_json:
+			api._print_interrupted_game_log(current_game_log)
+		raise api._GameLaunchInterruptionReported from None
+	current_game_log = api._current_game_log(
+		native_log_directory,
+		native_log_baseline,
+		game_started_ns,
+		managed_asset_paths=managed_asset_paths,
+		source_game=source if managed_asset_paths is not None else None,
+	)
+	current_game_crash = api._current_game_crash(
+		crash_directory,
+		crash_baseline,
+		game_started_ns,
+	)
+	runtime_issues = api._runtime_issue_summary(outcome.stderr)
+	retained_readiness_signal = api._game_readiness_signal(outcome.stderr)
+	game_readiness_signal = observed_readiness_signal or retained_readiness_signal
+	game_window_ready = game_readiness_signal is not None
+	runtime_issues["game_window_ready"] = game_window_ready
+	if game_readiness_signal is not None:
+		runtime_issues["game_readiness_signal"] = game_readiness_signal
+	if (
+		selection.kind == "proton7-container"
+		and runtime_issues["host_futex_fatal_count"]
+	):
+		runtime_issues["recommended_one_variable_comparison"] = "proton7"
+	elif selection.kind == "proton7" and runtime_issues["gstreamer_missing_libraries"]:
+		runtime_issues["recommended_one_variable_comparison"] = "proton7-container"
+	elif runtime_issues["dbghelp_symdeferred_assertion_count"]:
+		runtime_issues["recommended_one_variable_comparison"] = "umu"
+	clean_exit = outcome.returncode == 0 and current_game_crash is None
+	launch_evidence = game_readiness_signal
+	if launch_evidence is None and current_game_log is not None:
+		launch_evidence = "game_log"
+	elif launch_evidence is None and clean_exit:
+		launch_evidence = "clean_process_exit"
+	launch_succeeded = launch_evidence is not None
+	report = {
+		"ok": clean_exit,
+		"launch_succeeded": launch_succeeded,
+		"dry_run": dry_run,
+		"runtime": asdict(selection),
+		"umu_bootstrap": asdict(umu_bootstrap) if umu_bootstrap else None,
+		"realm": asdict(start_option),
+		"runtime_view": asdict(overlay) if overlay else None,
+		"depot_preflight": (
+			{
+				**asdict(depot_preflight),
+				"ready": depot_preflight.ready,
+				"fully_verified": depot_preflight.fully_verified,
+			}
+			if depot_preflight
+			else None
+		),
+		"setup_commands": [asdict(result) for result in setup_results],
+		"game": asdict(outcome),
+		"current_game_log": current_game_log,
+		"current_game_crash": current_game_crash,
+		"runtime_issues": runtime_issues,
+	}
+	game_runtime_seconds = max(0.0, time.monotonic() - game_started_at)
+	if telemetry is not None and not dry_run:
+		common_game_metadata: dict[str, object] = {
+			**launch_session_metadata,
+			**window_launch_metadata,
+			"runtime_seconds": round(game_runtime_seconds),
+			"clean_exit": clean_exit,
+			"timed_out": outcome.timed_out,
+			"launch_succeeded": launch_succeeded,
+			"game_window_ready": game_window_ready,
+			"readiness_signal": launch_evidence,
+			"crash_dump": current_game_crash is not None,
+			"session_duration_class": api._session_duration_class(game_runtime_seconds),
+			"runtime": selection.kind,
+			"realm": start_option.name,
+			**api._game_exit_metadata(outcome.returncode, selection.kind),
+		}
+		if launch_succeeded:
+			if not launch_success_reported:
+				assert launch_evidence is not None
+				telemetry.send_event(
+					"game_launch_success",
+					metadata={
+						**launch_session_metadata,
+						**window_launch_metadata,
+						"detection_duration_ms": round(game_runtime_seconds * 1000),
+						"detected_after_exit": True,
+						"game_window_ready": game_window_ready,
+						"readiness_signal": launch_evidence,
+						"runtime": selection.kind,
+						"realm": start_option.name,
+					},
+					context={"operation": "launch_game", "stage": "post_exit"},
+				)
+		else:
+			telemetry.send_event(
+				"game_launch_failed",
+				severity="error",
+				message=(
+					"Game client wrote a crash dump"
+					if current_game_crash is not None
+					else "Game session timed out"
+					if outcome.timed_out
+					else f"Game client exited with status {outcome.returncode}"
+				),
+				metadata={
+					**common_game_metadata,
+					"runtime_issues": runtime_issues,
+					"stdout": outcome.stdout,
+					"stderr": outcome.stderr,
+				},
+				context={"operation": "launch_game", "stage": "game_start"},
+			)
+		if launch_succeeded:
+			exit_message = None
+			if current_game_crash is not None:
+				exit_message = "Game client wrote a crash dump"
+			elif outcome.timed_out:
+				exit_message = "Game session timed out"
+			elif common_game_metadata.get("signal_inferred") is True:
+				exit_message = (
+					"Game session ended with status "
+					f"{common_game_metadata['raw_exit_code']}, consistent with "
+					f"{common_game_metadata['signal_name']} wrapped by UMU"
+				)
+			elif "signal" in common_game_metadata:
+				exit_message = (
+					"Game session was terminated by "
+					f"{common_game_metadata['signal_name']}"
+				)
+			elif outcome.returncode not in {0, None}:
+				exit_message = f"Game session ended with status {outcome.returncode}"
+			telemetry.send_event(
+				"game_exited",
+				severity=(
+					"error"
+					if current_game_crash is not None
+					else "info" if clean_exit else "warning"
+				),
+				message=exit_message,
+				metadata=(
+					common_game_metadata
+					if clean_exit
+					else {
+						**common_game_metadata,
+						"runtime_issues": runtime_issues,
+						"stdout": outcome.stdout,
+						"stderr": outcome.stderr,
+					}
+				),
+				context={"operation": "launch_game", "stage": "exited"},
+			)
+	if as_json or dry_run:
+		api._emit(report, as_json)
+	else:
+		api._print_game_outcome(
+			outcome,
+			current_game_log,
+			runtime_issues,
+			current_game_crash,
+		)
+	return 0 if outcome.returncode == 0 and current_game_crash is None else 1
+
+
+def session_duration_class(duration_seconds: float) -> str:
+	if duration_seconds < 30:
+		return "under_30_seconds"
+	if duration_seconds < 5 * 60:
+		return "under_5_minutes"
+	return "normal"
+
+
+def game_exit_metadata(
+	returncode: int | None,
+	runtime_kind: str,
+) -> dict[str, object]:
+	metadata: dict[str, object] = {"exit_code": returncode}
+	if returncode is None:
+		return metadata
+	if returncode < 0:
+		signal_number = -returncode
+		metadata.update(
+			{
+				"exit_code": 128 + min(signal_number, 127),
+				"raw_exit_code": returncode,
+				"signal": signal_number,
+				"signal_name": signal_name(signal_number),
+			}
+		)
+		return metadata
+
+	# UMU returns Popen's negative child status from a Python main function.
+	# SystemExit encodes -SIGKILL as 247 before our Python gamebox sees it.
+	wrapped_sigkill = 256 - int(signal.SIGKILL)
+	if runtime_kind in {"umu", "proton7-container"} and returncode == wrapped_sigkill:
+		metadata.update(
+			{
+				"exit_code": 128 + int(signal.SIGKILL),
+				"raw_exit_code": returncode,
+				"signal": int(signal.SIGKILL),
+				"signal_name": signal.SIGKILL.name,
+				"signal_inferred": True,
+				"signal_inference": "umu_python_system_exit",
+			}
+		)
+	return metadata
+
+
+def signal_name(signal_number: int) -> str:
+	try:
+		return signal.Signals(signal_number).name
+	except ValueError:
+		return f"signal {signal_number}"
+
+
+def ensure_portable_umu_for_play(
+	api: Any,
+	paths: AppPaths,
+	settings: Settings,
+	*,
+	dry_run: bool,
+) -> UmuBootstrapResult | None:
+	"""Provide a pinned UMU when the selected policy may use a container."""
+
+	if settings.runtime == "proton7":
+		return None
+	if dry_run:
+		return None
+	try:
+		return api.provision_umu(paths)
+	except (OSError, RuntimeError) as exc:
+		if settings.runtime != "auto":
+			raise LauncherError(
+				f"the verified portable UMU runtime helper could not be installed: {exc}"
+			) from exc
+		try:
+			api.select_runtime(replace(settings, runtime="proton7"), paths=paths)
+		except RuntimeErrorPT:
+			raise LauncherError(
+				"no usable game runtime is available and the verified portable UMU "
+				f"runtime helper could not be installed: {exc}"
+			) from exc
+		print(
+			"Warning: the Steam Runtime helper could not be installed; falling back "
+			f"to direct Proton 7 for this launch ({exc}).",
+			file=sys.stderr,
+		)
+		return None
+
+
+def current_game_log(
+	api: Any,
+	directory: Path,
+	baseline: dict[str, LogFileState],
+	started_ns: int,
+	*,
+	managed_asset_paths: Sequence[str] | None = None,
+	source_game: Path | None = None,
+) -> dict[str, object] | None:
+	state = api.newest_current_native_log(
+		directory,
+		baseline,
+		started_ns,
+		patterns=("log_*.txt",),
+	)
+	if state is None:
+		return None
+	analysis = api.parse_current_run_log(state, baseline)
+	asset_references = api.classify_asset_references(
+		analysis,
+		managed_asset_paths,
+		source_game=source_game,
+	)
+	return {
+		"path": str(state.path),
+		"modified_at": datetime.fromtimestamp(
+			state.mtime_ns / 1_000_000_000
+		).astimezone().isoformat(),
+		"size": state.size,
+		"load_texture_to_material_failed": analysis.load_texture_to_material_failed,
+		"import_scene_threw": analysis.import_scene_threw,
+		"asset_pack_health_failed": analysis.asset_pack_health_failed,
+		"managed_asset_integrity_failed": asset_references.managed_integrity_failed,
+		"asset_references": asset_references.to_dict(),
+		"runtime_out_of_memory": analysis.runtime_out_of_memory,
+		"out_of_memory_count": len(analysis.out_of_memory_events),
+		"out_of_memory_effect_paths": analysis.out_of_memory_effect_paths,
+		"effect_creation_failures": [
+			event.to_dict() for event in analysis.effect_creation_failures
+		],
+		"failed_import_scenes": analysis.failed_import_scenes,
+		"stage_without_new_stage": analysis.stage_without_new_stage,
+		"module_code_sync_error": analysis.module_code_sync_error,
+		"module_code_sync_left": analysis.module_code_sync_left,
+		"module_code_sync_right": analysis.module_code_sync_right,
+		"module_code_sync_delta": analysis.module_code_sync_delta,
+		"banned_code_1": analysis.banned_code_1,
+		"banned_code_1_in_native_log": analysis.banned_code_1,
+		"banned_code_1_observation_scope": (
+			"native-game-log-only; server-provided login-screen text is not "
+			"written to this log"
+		),
+		"failed_file_find_count": analysis.failed_file_find_count,
+		"failed_file_load_count": analysis.failed_file_load_count,
+		"failed_file_read_count": analysis.failed_file_read_count,
+		"failed_asset_file_count": analysis.failed_asset_file_count,
+		"failed_texture_file_count": analysis.failed_texture_file_count,
+		"failed_effect_file_count": analysis.failed_effect_file_count,
+		"missing_texture_reference_count": analysis.missing_texture_reference_count,
+		"missing_effect_reference_count": analysis.missing_effect_reference_count,
+		"missing_image_reference_count": analysis.missing_image_reference_count,
+		"missing_pack_image_reference_count": analysis.missing_pack_image_reference_count,
+		"stage_without_new_stage_events": [
+			event.to_dict()
+			for event in analysis.events
+			if event.kind == "stage_without_new_stage"
+		],
+		"scene_imports": {
+			name: [scene.to_dict() for scene in imports]
+			for name, imports in sorted(analysis.scenes.items())
+		},
+		"failed_file_count": len(analysis.failed_files),
+		"failed_files": [event.to_dict() for event in analysis.failed_files[:64]],
+	}
+
+
+def current_game_crash(
+	api: Any,
+	directory: Path,
+	baseline: dict[str, LogFileState],
+	started_ns: int,
+) -> dict[str, object] | None:
+	state = api.newest_current_native_log(
+		directory,
+		baseline,
+		started_ns,
+		patterns=("*.dat", "*.dmp"),
+	)
+	if state is None:
+		return None
+	return {
+		"path": str(state.path),
+		"modified_at": datetime.fromtimestamp(
+			state.mtime_ns / 1_000_000_000
+		).astimezone().isoformat(),
+		"size": state.size,
+	}
+
+
+def runtime_issue_summary(stderr: str) -> dict[str, object]:
+	folded = stderr.casefold()
+	futex_message = "the futex facility returned an unexpected error code"
+	wrong_elf_message = "wrong elf class: elfclass64"
+	dbghelp_assertion = "assertion failed: module->module.symtype != symdeferred"
+	bwrap_uid_map_denied = "bwrap: setting up uid map: permission denied"
+	missing_libraries = sorted(
+		{
+			library
+			for line in folded.splitlines()
+			if "gstreamer-warning" in line and "failed to load plugin" in line
+			for library in re.findall(
+				r"([a-z0-9_.+-]+\.so(?:\.\d+)*): cannot open shared object file",
+				line,
+			)
+		}
+	)
+	return {
+		"game_window_ready": game_window_was_ready(folded),
+		"host_futex_fatal_count": folded.count(futex_message),
+		"gstreamer_wrong_elf_class_count": folded.count(wrong_elf_message),
+		"gstreamer_missing_library_count": len(missing_libraries),
+		"gstreamer_missing_libraries": missing_libraries,
+		"gstreamer_stream_error": "winegstreamer error" in folded,
+		"mesa_egl_initialization_failed": "egl: failed to create dri2 screen" in folded,
+		"gamescope_present_queue_unsupported": (
+			"physical device queue doesn't support presenting on our surface" in folded
+		),
+		"gamescope_vulkan_output_failed_count": folded.count(
+			"vulkan_make_output failed"
+		),
+		"steam_api_app_id_missing": "steamapi_init() failed; no appid found" in folded,
+		"dbghelp_symdeferred_assertion_count": folded.count(dbghelp_assertion),
+		"bubblewrap_uid_map_permission_denied": bwrap_uid_map_denied in folded,
+	}
+
+
+def gamescope_presentation_failure(output: str) -> str | None:
+	folded = output.casefold()
+	for diagnostic, marker in (
+		(
+			"gamescope_present_queue_unsupported",
+			"physical device queue doesn't support presenting on our surface",
+		),
+		("gamescope_vulkan_output_failed", "vulkan_make_output failed"),
+	):
+		if marker in folded:
+			return diagnostic
+	return None
+
+
+def game_window_was_ready(stderr: str) -> bool:
+	return game_readiness_signal(stderr) is not None
+
+
+def game_readiness_signal(output: str) -> str | None:
+	folded = output.casefold()
+	for signal_name, marker in (
+		("window_ready", "game window ready:"),
+		("rendered_frame", "rendered game frame:"),
+		(
+			"window_supervision",
+			"game window resizing is disabled to prevent repeated direct3d device resets",
+		),
+	):
+		if marker in folded:
+			return signal_name
+	return None
+
+
+def window_diagnostic_severity(diagnostic: dict[str, object]) -> str:
+	name = diagnostic.get("diagnostic")
+	details = diagnostic.get("details")
+	if isinstance(name, str) and (
+		name.endswith(("_failed", "_unavailable"))
+		or name in {
+			"host_hidden_state_cleared",
+			"host_inactive_remap",
+			"host_minimize_latched",
+		}
+	):
+		return "warning"
+	if isinstance(details, dict):
+		if name == "host_scaling_configured" and not all(
+			details.get(key) is True
+			for key in (
+				"resize_increments_applied",
+				"scaling_enabled",
+				"compositing_preferred",
+			)
+		):
+			return "warning"
+		if name == "scaling_configured" and details.get("enabled") is not True:
+			return "warning"
+	return "debug"
+
+
+def print_game_outcome(
+	outcome: CommandOutcome,
+	current_game_log: dict[str, object] | None,
+	runtime_issues: dict[str, object],
+	current_game_crash: dict[str, object] | None = None,
+) -> None:
+	# Keep the human-facing stream concise. CommandRunner already relayed every
+	# process line live; replaying its capture here made each Proton failure appear
+	# twice in the dashboard.
+	if current_game_crash is not None:
+		crash_path = current_game_crash.get("path")
+		crash_path_text = crash_path if isinstance(crash_path, str) else "unknown"
+		print(
+			f"Game client crashed and wrote a dump: {crash_path_text}",
+			file=sys.stderr,
+		)
+	elif outcome.timed_out:
+		print("Game client timed out and was stopped.", file=sys.stderr)
+	elif outcome.returncode == 0:
+		print("Game client exited normally.")
+	elif outcome.returncode is None:
+		print("Game client exited without a status.", file=sys.stderr)
+	else:
+		print(f"Game client exited with status {outcome.returncode}.", file=sys.stderr)
+	if current_game_log is not None:
+		print_interrupted_game_log(current_game_log)
+	wrong_elf_count = runtime_issues["gstreamer_wrong_elf_class_count"]
+	if isinstance(wrong_elf_count, int) and wrong_elf_count:
+		print(
+			"The repeated GStreamer wrong-ELF-class messages are plugin-scan noise; "
+			"they do not mean that Proton itself failed to start.",
+			file=sys.stderr,
+		)
+	missing_libraries = runtime_issues["gstreamer_missing_libraries"]
+	if isinstance(missing_libraries, list) and missing_libraries:
+		print(
+			"Media plugins could not load these shared libraries: "
+			+ ", ".join(str(value) for value in missing_libraries)
+			+ ".",
+			file=sys.stderr,
+		)
+	assertion_count = runtime_issues["dbghelp_symdeferred_assertion_count"]
+	if isinstance(assertion_count, int) and assertion_count:
+		print(
+			"Proton 7's older Wine build hit its dbghelp SymDeferred assertion; this "
+			"can mask the client failure that occurred immediately before it.",
+			file=sys.stderr,
+		)
+	if runtime_issues["bubblewrap_uid_map_permission_denied"]:
+		print(
+			"Ubuntu denied Bubblewrap's UID map before Proton started. Run "
+			"`pristontale-eu container-host --repair` and retry.",
+			file=sys.stderr,
+		)
+	recommendation = runtime_issues.get("recommended_one_variable_comparison")
+	if isinstance(recommendation, str):
+		print(
+			f"Recommended single-variable runtime comparison: {recommendation}.",
+			file=sys.stderr,
+		)
+
+
+def print_interrupted_game_log(report: dict[str, object]) -> None:
+	log_path = report.get("path")
+	log_path_text = log_path if isinstance(log_path, str) else "unknown"
+	print(f"\nCurrent game log: {log_path_text}", file=sys.stderr)
+	asset_references = report.get("asset_references")
+	catalog_available = (
+		asset_references.get("catalog_available")
+		if isinstance(asset_references, dict)
+		else False
+	)
+	if report["module_code_sync_error"]:
+		print(
+			"Detected a publisher module-integrity mismatch; the game was launched "
+			"with publisher-pristine code in this launcher version.",
+			file=sys.stderr,
+		)
+	elif report["runtime_out_of_memory"]:
+		effects = report.get("out_of_memory_effect_paths")
+		effect_text = ""
+		if isinstance(effects, list) and effects:
+			effect_text = " while creating " + ", ".join(str(path) for path in effects[:3])
+		print(
+			"Detected Direct3D resource exhaustion in the 32-bit game process"
+			+ effect_text
+			+ ". Restarting the client can recover temporarily; depot repair will not "
+			"fix this failure.",
+			file=sys.stderr,
+		)
+	elif report["managed_asset_integrity_failed"]:
+		print(
+			"The game reported an asset that belongs to the publisher manifest but is "
+			"missing from the managed installation.",
+			file=sys.stderr,
+		)
+		print(
+			"Run `pristontale-eu update --repair` and restart.",
+			file=sys.stderr,
+		)
+	elif report["asset_pack_health_failed"] and not catalog_available:
+		print(
+			"The game reported many unresolved asset paths, but no matching cached "
+			"publisher manifest was available to classify them. Run "
+			"`pristontale-eu update` to refresh the manifest cache.",
+			file=sys.stderr,
+		)
+	elif report["load_texture_to_material_failed"]:
+		print(
+			"Detected a texture/material failure while loading the game world.",
+			file=sys.stderr,
+		)
+	elif report["import_scene_threw"] or report["failed_import_scenes"]:
+		print("Detected a game-world scene import failure.", file=sys.stderr)
+
+
+def login_trace(
+	paths: AppPaths,
+	game_dir: Path | None,
+	no_box: bool,
+	skip_runtime_setup: bool,
+	timeout_seconds: float,
+	as_json: bool,
+) -> int:
+	# Preserve the command name so old instructions fail safely before touching
+	# the prefix, preparing the runtime view, or starting Game.exe.
+	_ = paths, game_dir, no_box, skip_runtime_setup, timeout_seconds, as_json
+	raise RuntimeError(LOGIN_TRACE_DISABLED_REASON)

src/ptlinux/application/commands/settings.py

@@ -0,0 +1,32 @@
+"""Launcher settings command workflow."""
+
+from __future__ import annotations
+
+from dataclasses import asdict
+from typing import Any
+
+from ...paths import AppPaths
+
+
+def settings(
+	api: Any,
+	paths: AppPaths,
+	initialize: bool,
+	reset: bool,
+	as_json: bool,
+) -> int:
+	if reset:
+		settings = api.reset_settings(paths)
+	elif initialize:
+		settings = api.ensure_settings(paths)
+	else:
+		settings = api.load_settings(paths)
+	api._emit(
+		{
+			"ok": True,
+			"path": str(paths.settings_file),
+			"settings": asdict(settings),
+		},
+		as_json,
+	)
+	return 0

src/ptlinux/application/common.py

@@ -0,0 +1,245 @@
+"""Shared CLI telemetry, result reporting, and output helpers."""
+
+from __future__ import annotations
+
+import argparse
+import json
+import signal
+import time
+from collections.abc import Callable
+from dataclasses import dataclass
+from typing import Any
+
+from ..command import CommandError
+from ..paths import AppPaths
+from ..telemetry import TelemetryService
+
+
+CommandTelemetryEvents = tuple[str, str, str, str]
+
+
+@dataclass(frozen=True, slots=True)
+class CommandTelemetryLifecycle:
+	telemetry: TelemetryService | None
+	events: CommandTelemetryEvents | None
+	started_at: float
+	owner: bool
+
+
+def start_command_telemetry(
+	api: Any,
+	paths: AppPaths,
+	command: str,
+	arguments: argparse.Namespace,
+	manage_telemetry: bool,
+) -> CommandTelemetryLifecycle:
+	telemetry: TelemetryService | None = None
+	telemetry_owner = False
+	if manage_telemetry:
+		interface = "gui" if command == "gui" else "cli"
+		telemetry, telemetry_owner = api.initialize_shared_telemetry(
+			paths,
+			session_metadata={"interface": interface, "command": command},
+			report_launcher_lifecycle=command == "gui",
+		)
+	events = api._command_telemetry_events(command, arguments, paths)
+	started_at = time.monotonic()
+	if telemetry is not None and events is not None:
+		operation, started_event, _success_event, _failed_event = events
+		if operation == "repair":
+			telemetry.send_event(
+				"repair_requested",
+				metadata={"command": command, "reason": "user_requested"},
+				context={"operation": operation, "stage": "requested"},
+			)
+		telemetry.send_event(
+			started_event,
+			metadata={"command": command},
+			context={"operation": operation, "stage": "started"},
+		)
+	return CommandTelemetryLifecycle(
+		telemetry=telemetry,
+		events=events,
+		started_at=started_at,
+		owner=telemetry_owner,
+	)
+
+
+def shutdown_command_telemetry(
+	api: Any,
+	lifecycle: CommandTelemetryLifecycle,
+) -> None:
+	if lifecycle.telemetry is not None and lifecycle.owner:
+		api.shutdown_shared_telemetry(lifecycle.telemetry)
+
+
+def command_telemetry_events(
+	command: str,
+	arguments: argparse.Namespace,
+	paths: AppPaths,
+) -> CommandTelemetryEvents | None:
+	if bool(getattr(arguments, "dry_run", False)):
+		return None
+	if command in {"update", "sync", "wine-update"}:
+		if bool(getattr(arguments, "repair", False)):
+			return ("repair", "repair_started", "repair_success", "repair_failed")
+		if not paths.source_game.exists():
+			return ("install", "install_started", "install_success", "install_failed")
+		return ("update", "update_started", "update_success", "update_failed")
+	if command == "launcher-update" and not (
+		bool(getattr(arguments, "check", False))
+		or bool(getattr(arguments, "verify", False))
+		or getattr(arguments, "rollback", None) is not None
+	):
+		return (
+			"launcher_update",
+			"update_started",
+			"update_success",
+			"update_failed",
+		)
+	if command in {"setup", "runtime-bootstrap"}:
+		return (
+			"runtime_install",
+			"runtime_install_started",
+			"runtime_install_success",
+			"runtime_install_failed",
+		)
+	if command == "doctor":
+		return (
+			"compatibility_check",
+			"compatibility_check_started",
+			"compatibility_check_completed",
+			"compatibility_check_failed",
+		)
+	return None
+
+
+def report_command_result(
+	telemetry: TelemetryService | None,
+	events: CommandTelemetryEvents | None,
+	command: str,
+	started_at: float,
+	returncode: int,
+) -> None:
+	if telemetry is None or events is None:
+		return
+	operation, _started_event, success_event, failed_event = events
+	duration_ms = round((time.monotonic() - started_at) * 1000)
+	telemetry.send_event(
+		success_event if returncode == 0 else failed_event,
+		severity="info" if returncode == 0 else "error",
+		message=None if returncode == 0 else f"Command exited with status {returncode}",
+		metadata={
+			"command": command,
+			"duration_ms": duration_ms,
+			"exit_code": returncode,
+		},
+		context={
+			"operation": operation,
+			"stage": "completed" if returncode == 0 else "command_exit",
+		},
+	)
+
+
+def report_command_failure(
+	telemetry: TelemetryService | None,
+	events: CommandTelemetryEvents | None,
+	command: str,
+	started_at: float,
+	message: str,
+	*,
+	stage: str = "failed",
+) -> None:
+	if telemetry is None:
+		return
+	if command == "play":
+		telemetry.send_event(
+			"game_launch_failed",
+			severity="error",
+			message=message,
+			metadata={
+				"duration_ms": round((time.monotonic() - started_at) * 1000),
+			},
+			context={"operation": "launch_game", "stage": stage},
+		)
+		return
+	if events is None:
+		return
+	operation, _started_event, _success_event, failed_event = events
+	telemetry.send_event(
+		failed_event,
+		severity="error",
+		message=message,
+		metadata={
+			"command": command,
+			"duration_ms": round((time.monotonic() - started_at) * 1000),
+		},
+		context={"operation": operation, "stage": stage},
+	)
+
+
+def report_game_launch_cancelled(
+	telemetry: TelemetryService | None,
+	started_at: float,
+	*,
+	stage: str,
+	metadata: dict[str, object] | None = None,
+) -> None:
+	if telemetry is None:
+		return
+	event_metadata: dict[str, object] = {
+		"duration_ms": round((time.monotonic() - started_at) * 1000),
+		"interrupted": True,
+		"launcher_exit_code": 130,
+		"signal": int(signal.SIGINT),
+		"signal_name": signal.SIGINT.name,
+	}
+	if metadata is not None:
+		event_metadata.update(metadata)
+	telemetry.send_event(
+		"game_launch_cancelled",
+		severity="info",
+		message="Game launch was cancelled",
+		metadata=event_metadata,
+		context={"operation": "launch_game", "stage": stage},
+	)
+
+
+def failure_stage(command: str, exception: BaseException) -> str:
+	if isinstance(exception, ValueError):
+		return "configuration"
+	if isinstance(exception, CommandError):
+		return "subprocess"
+	message = str(exception).casefold()
+	if any(value in message for value in ("manifest", "cdn", "request failed")):
+		return "manifest"
+	if any(value in message for value in ("download", "incomplete response")):
+		return "download"
+	if any(value in message for value in ("sha-1", "checksum", "hash mismatch")):
+		return "validation"
+	if any(
+		value in message
+		for value in ("permission", "read-only", "cannot write", "writable")
+	):
+		return "filesystem"
+	if any(value in message for value in ("prefix", "wine", "proton", "umu")):
+		return "runtime_check"
+	return f"{command}_operation"
+
+
+def emit(
+	value: object,
+	as_json: bool,
+	*,
+	json_printer: Callable[[object], None],
+) -> None:
+	if as_json:
+		json_printer(value)
+	else:
+		if isinstance(value, dict) and value.get("ok") is True:
+			print("Done.")
+		print(json.dumps(value, indent=2, sort_keys=True))
+
+
+def print_json(value: object) -> None:
+	print(json.dumps(value, indent=2, sort_keys=True))

src/ptlinux/cli.py

@@ -0,0 +1,918 @@
+"""Command-line interface for installation, updates, repair, and play."""
+
+from __future__ import annotations
+
+import argparse
+from contextlib import AbstractContextManager, nullcontext
+from dataclasses import asdict, replace
+from datetime import datetime
+import json
+from pathlib import Path
+import re
+import signal
+import sys
+import threading
+from typing import Callable, Sequence
+from uuid import uuid4
+
+from .diagnostics.native_logs import (
+	LogFileState,
+	classify_asset_references,
+	newest_current_native_log,
+	parse_current_run_log,
+	snapshot_native_logs,
+)
+
+from . import __version__
+from .application import common as _application_helpers
+from .application.commands import health as _health_commands
+from .application.commands import installation as _installation_commands
+from .application.commands import launcher_update as _launcher_update_commands
+from .application.commands import play as _play_commands
+from .application.commands import settings as _settings_commands
+from .command import CommandError, CommandOutcome, CommandRunner
+from .container_host import (
+	ContainerHostReport,
+	container_host_error,
+	inspect_container_host,
+	repair_container_host,
+	repair_container_host_after_update,
+)
+from .depot import (
+	DownloadOptions,
+	SyncProgress,
+	read_cached_depot_launch_catalog,
+	read_current_depot_file_catalog,
+	preflight_managed_game,
+	select_depot_start_option,
+	sync_managed_game,
+)
+from .doctor import inspect_host
+from .download import OFFICIAL_LAUNCHER_URL, fetch_official_launcher
+from .importer import GameImportResult, discover_existing_game, import_existing_game
+from .import_state import game_import_requires_verification, mark_game_import_verified
+from .launcher import (
+	LauncherError,
+	WineTools,
+	configure_launcher_prefix,
+	find_wine_tools,
+	launch_official_updater,
+	prepare_launcher_binary,
+)
+from .locking import (
+	LauncherPlayLease,
+	launcher_operation_lock,
+	launcher_play_lock,
+	managed_game_process_is_active,
+)
+from .login_diagnostics import inspect_login_environment
+from .login_trace import DEFAULT_TRACE_TIMEOUT_SECONDS, LOGIN_TRACE_DISABLED_REASON
+from .overlay import cache_compatibility_binaries, prepare_runtime_view
+from .paths import AppPaths
+from .runtime import (
+	RuntimeErrorPT,
+	game_runtime_ready,
+	prepare_game_runtime,
+	run_game,
+	select_runtime,
+)
+from .settings import Settings, ensure_settings, load_settings, reset_settings
+from .self_update import (
+	check_for_launcher_update,
+	install_launcher_update,
+	rollback_launcher_update,
+	update_check_to_dict,
+	verify_launcher_update_channel,
+)
+from .update_resolver import STABLE_CHANNEL
+from .telemetry import (
+	classify_network_failure,
+	current_telemetry,
+	initialize_shared_telemetry,
+	network_http_status,
+	shutdown_shared_telemetry,
+)
+from .system_identity import is_running_inside_steam_runtime
+from .umu import (
+	UmuBootstrapResult,
+	find_umu_launcher,
+	provision_umu,
+	provision_umu_for_startup,
+)
+from .window_diagnostics import (
+	WINDOW_DIAGNOSTICS_ENV,
+	WINDOW_DIAGNOSTICS_SESSION_ENV,
+	parse_window_diagnostic,
+)
+
+
+class _GameLaunchInterruptionReported(KeyboardInterrupt):
+	"""Mark an in-game interrupt whose cancellation telemetry was already sent."""
+
+
+def build_parser() -> argparse.ArgumentParser:
+	parser = argparse.ArgumentParser(
+		prog="pristontale-eu",
+		description="PristonTale EU all-in-one Linux installer and clean launcher",
+	)
+	# Python 3.14 enables ANSI-colored argparse output by default. Keep the CLI's
+	# help and error text stable for redirected output and downstream tooling.
+	if hasattr(parser, "color"):
+		parser.color = False
+	parser.add_argument(
+		"--version",
+		action="version",
+		version=f"%(prog)s {__version__}",
+	)
+	parser.add_argument("--json", action="store_true", help="emit machine-readable output")
+	subparsers = parser.add_subparsers(dest="command")
+
+	subparsers.add_parser("gui", help="open the native Linux dashboard")
+	subparsers.add_parser("doctor", help="check cross-distribution dependencies")
+	container_host = subparsers.add_parser(
+		"container-host",
+		help="check Bubblewrap and Ubuntu AppArmor for the Steam Runtime",
+	)
+	container_host.add_argument(
+		"--repair",
+		action="store_true",
+		help="repair only recognized Ubuntu AppArmor profile states",
+	)
+	subparsers.add_parser(
+		"runtime-bootstrap",
+		help="download and verify the Steam Runtime launcher helper",
+	)
+	login_diagnostics = subparsers.add_parser(
+		"login-diagnostics",
+		help="check the client, runtime, and publisher login route without credentials",
+	)
+	login_diagnostics.add_argument(
+		"--timeout",
+		type=float,
+		default=5.0,
+		help="TCP connection timeout in seconds (default: 5)",
+	)
+	login_diagnostics.add_argument(
+		"--runtime",
+		choices=("configured", "auto", "proton7", "proton7-container", "umu"),
+		default="configured",
+		help=(
+			"probe one runtime without changing settings or starting the game "
+			"(default: configured)"
+		),
+	)
+
+	fetch = subparsers.add_parser("fetch", help="fetch and safely prepare the latest official launcher")
+	fetch.add_argument("--dry-run", action="store_true")
+
+	setup = subparsers.add_parser("setup", help="configure Wine and .NET Desktop for the updater")
+	setup.add_argument("--dry-run", action="store_true")
+	setup.add_argument("--force-runtime", action="store_true")
+
+	update = subparsers.add_parser(
+		"update",
+		help="safely synchronize the official game depot without Wine",
+	)
+	update.add_argument("--dry-run", action="store_true")
+	update.add_argument("--repair", action="store_true", help="hash-check every game file")
+	import_options = update.add_mutually_exclusive_group()
+	import_options.add_argument(
+		"--seed-from",
+		type=Path,
+		help="import an existing game before updating",
+	)
+	import_options.add_argument(
+		"--no-import",
+		action="store_true",
+		help="disable automatic existing-game discovery",
+	)
+
+	sync = subparsers.add_parser(
+		"sync",
+		help="native official depot synchronization without bootstrap discovery",
+	)
+	sync.add_argument("--dry-run", action="store_true")
+	sync.add_argument("--repair", action="store_true", help="hash-check every game file")
+
+	legacy_update = subparsers.add_parser(
+		"wine-update",
+		help="legacy official WPF updater (normally unnecessary)",
+	)
+	legacy_update.add_argument("--dry-run", action="store_true")
+	legacy_update.add_argument("--force-runtime", action="store_true")
+	legacy_import_options = legacy_update.add_mutually_exclusive_group()
+	legacy_import_options.add_argument("--seed-from", type=Path)
+	legacy_import_options.add_argument("--no-import", action="store_true")
+
+	import_game = subparsers.add_parser(
+		"import-game",
+		help="safely seed the managed installation from an existing game",
+	)
+	import_game.add_argument("source", type=Path)
+	import_game.add_argument("--dry-run", action="store_true")
+
+	compatibility = subparsers.add_parser(
+		"cache-compatibility",
+		help="cache one exact verified Game.exe/game.dll compatibility pair",
+	)
+	compatibility.add_argument("source", type=Path)
+	prepare = subparsers.add_parser("prepare", help="build the read-only runtime view and scene fix")
+	prepare.add_argument("--game-dir", type=Path)
+
+	play = subparsers.add_parser("play", help="launch the game in the managed Proton window")
+	play.add_argument("--game-dir", type=Path)
+	play.add_argument(
+		"--realm",
+		help="launch an available realm from the last official depot manifest",
+	)
+	play.add_argument("--no-box", action="store_true", help="launch without X11 window styling")
+	play.add_argument(
+		"--publisher-dll",
+		"--no-world-fix",
+		action="store_true",
+		dest="publisher_dll",
+		help=(
+			"compatibility option retained for older scripts; publisher code is "
+			"always used without the retired world fix"
+		),
+	)
+	play.add_argument("--dry-run", action="store_true")
+	play.add_argument("--skip-runtime-setup", action="store_true")
+	login_trace = subparsers.add_parser(
+		"login-trace",
+		help="retired unsafe authentication trace (always refuses to launch)",
+	)
+	login_trace.add_argument("--game-dir", type=Path)
+	login_trace.add_argument("--no-box", action="store_true", help="launch without X11 window styling")
+	login_trace.add_argument("--skip-runtime-setup", action="store_true")
+	login_trace.add_argument(
+		"--timeout",
+		type=float,
+		default=DEFAULT_TRACE_TIMEOUT_SECONDS,
+		help="maximum game runtime in seconds (default: 600)",
+	)
+
+	settings = subparsers.add_parser("settings", help="show, initialize, or reset settings")
+	settings_action = settings.add_mutually_exclusive_group()
+	settings_action.add_argument(
+		"--init",
+		action="store_true",
+		help="create missing settings and migrate legacy files without resetting choices",
+	)
+	settings_action.add_argument(
+		"--reset",
+		action="store_true",
+		help="explicitly replace all launcher settings with defaults",
+	)
+
+	launcher_update = subparsers.add_parser(
+		"launcher-update",
+		help="check, verify, install, or roll back the native Linux launcher",
+	)
+	launcher_action = launcher_update.add_mutually_exclusive_group()
+	launcher_action.add_argument(
+		"--check",
+		action="store_true",
+		help="authenticate the update manifest without installing it",
+	)
+	launcher_action.add_argument(
+		"--verify",
+		action="store_true",
+		help="download and fully validate the published release without installing it",
+	)
+	launcher_action.add_argument(
+		"--rollback",
+		nargs="?",
+		const="",
+		metavar="VERSION",
+		help=(
+			"switch to VERSION from signed release history; without VERSION, "
+			"switch to the locally retained previous release"
+		),
+	)
+	launcher_update.add_argument(
+		"--manifest-url",
+		help="override the signed stable-manifest URL",
+	)
+	launcher_update.add_argument(
+		"--public-key",
+		type=Path,
+		help="override the pinned launcher-update public key",
+	)
+	launcher_update.add_argument(
+		"--history-url",
+		help="override the signed launcher release-history URL",
+	)
+	return parser
+
+
+def main(
+	argv: Sequence[str] | None = None,
+	*,
+	_manage_telemetry: bool | None = None,
+) -> int:
+	parser = build_parser()
+	arguments = parser.parse_args(argv)
+	command = arguments.command or "gui"
+	paths = AppPaths.from_environment()
+	manage_telemetry = argv is None if _manage_telemetry is None else _manage_telemetry
+	telemetry_lifecycle = _start_command_telemetry(
+		sys.modules[__name__],
+		paths,
+		command,
+		arguments,
+		manage_telemetry,
+	)
+	telemetry = telemetry_lifecycle.telemetry
+	telemetry_events = telemetry_lifecycle.events
+	operation_started = telemetry_lifecycle.started_at
+	try:
+		returncode = _dispatch_command(parser, arguments, command, paths)
+	except KeyboardInterrupt as exc:
+		if command == "play":
+			if (
+				not isinstance(exc, _GameLaunchInterruptionReported)
+				and not bool(getattr(arguments, "dry_run", False))
+			):
+				_report_game_launch_cancelled(
+					telemetry,
+					operation_started,
+					stage="preflight",
+				)
+		else:
+			_report_command_failure(
+				telemetry,
+				telemetry_events,
+				command,
+				operation_started,
+				"Operation interrupted",
+				stage="interrupted",
+			)
+		message = "Interrupted; PristonTale and its compatibility runtime were stopped."
+		if arguments.json:
+			_print_json({"ok": False, "error": message, "interrupted": True})
+		else:
+			print(f"\n{message}", file=sys.stderr)
+		return 130
+	except (ValueError, OSError, RuntimeError) as exc:
+		_report_command_failure(
+			telemetry,
+			telemetry_events,
+			command,
+			operation_started,
+			str(exc),
+			stage=_failure_stage(command, exc),
+		)
+		if telemetry is not None and isinstance(exc, ValueError):
+			telemetry.send_event(
+				"configuration_error",
+				severity="error",
+				message=str(exc),
+				metadata={"setting": "unknown", "reason": "invalid_value"},
+				context={"operation": command, "stage": "configuration"},
+			)
+		if arguments.json:
+			_print_json({"ok": False, "error": str(exc)})
+		else:
+			print(f"Error: {exc}", file=sys.stderr)
+			if isinstance(exc, CommandError):
+				if exc.outcome.stdout:
+					print(exc.outcome.stdout.rstrip(), file=sys.stderr)
+				if exc.outcome.stderr:
+					print(exc.outcome.stderr.rstrip(), file=sys.stderr)
+		return 1
+	except BaseException as exc:
+		if telemetry is not None:
+			telemetry.report_exception(
+				"launcher_exception",
+				exc,
+				metadata={"command": command},
+				context={"operation": command, "stage": "dispatch"},
+				severity="critical",
+			)
+		_report_command_failure(
+			telemetry,
+			telemetry_events,
+			command,
+			operation_started,
+			str(exc),
+			stage="dispatch",
+		)
+		raise
+	else:
+		_report_command_result(
+			telemetry,
+			telemetry_events,
+			command,
+			operation_started,
+			returncode,
+		)
+		return returncode
+	finally:
+		_shutdown_command_telemetry(sys.modules[__name__], telemetry_lifecycle)
+
+
+def _dispatch_command(
+	parser: argparse.ArgumentParser,
+	arguments: argparse.Namespace,
+	command: str,
+	paths: AppPaths,
+) -> int:
+	if command == "gui":
+		provision_umu_for_startup(paths)
+		_container_host_startup_migration(paths)
+		from .ui import run_dashboard
+
+		run_dashboard(paths)
+		return 0
+	if command == "doctor":
+		return _doctor(arguments.json)
+	if command == "container-host":
+		return _container_host(arguments.repair, arguments.json)
+	if command == "runtime-bootstrap":
+		return _runtime_bootstrap(paths, arguments.json)
+	if command == "login-diagnostics":
+		return _login_diagnostics(
+			paths,
+			arguments.timeout,
+			arguments.runtime,
+			arguments.json,
+		)
+	if command == "fetch":
+		return _fetch(paths, arguments.dry_run, arguments.json)
+	if command == "setup":
+		return _setup(
+			paths,
+			arguments.dry_run,
+			arguments.force_runtime,
+			arguments.json,
+		)
+	if command == "update":
+		return _native_update(
+			paths,
+			arguments.dry_run,
+			arguments.repair,
+			arguments.seed_from,
+			arguments.no_import,
+			arguments.json,
+		)
+	if command == "sync":
+		return _native_update(
+			paths,
+			arguments.dry_run,
+			arguments.repair,
+			None,
+			True,
+			arguments.json,
+		)
+	if command == "wine-update":
+		return _wine_update(
+			paths,
+			arguments.dry_run,
+			arguments.force_runtime,
+			arguments.seed_from,
+			arguments.no_import,
+			arguments.json,
+		)
+	if command == "import-game":
+		return _import_game(
+			paths,
+			arguments.source,
+			arguments.dry_run,
+			arguments.json,
+		)
+	if command == "cache-compatibility":
+		result = cache_compatibility_binaries(paths, arguments.source)
+		_emit({"ok": True, "compatibility": asdict(result)}, arguments.json)
+		return 0
+	if command == "prepare":
+		return _prepare(paths, arguments.game_dir, arguments.json)
+	if command == "play":
+		return _play(
+			paths,
+			arguments.game_dir,
+			arguments.no_box,
+			arguments.dry_run,
+			arguments.skip_runtime_setup,
+			arguments.json,
+			realm=arguments.realm,
+		)
+	if command == "login-trace":
+		return _login_trace(
+			paths,
+			arguments.game_dir,
+			arguments.no_box,
+			arguments.skip_runtime_setup,
+			arguments.timeout,
+			arguments.json,
+		)
+	if command == "settings":
+		return _settings(paths, arguments.init, arguments.reset, arguments.json)
+	if command == "launcher-update":
+		return _launcher_update(
+			paths,
+			arguments.check,
+			arguments.verify,
+			arguments.rollback,
+			arguments.manifest_url,
+			arguments.public_key,
+			arguments.json,
+			history_url=arguments.history_url,
+		)
+	parser.error(f"unknown command: {command}")
+
+
+_command_telemetry_events = _application_helpers.command_telemetry_events
+_start_command_telemetry = _application_helpers.start_command_telemetry
+_shutdown_command_telemetry = _application_helpers.shutdown_command_telemetry
+_report_command_result = _application_helpers.report_command_result
+_report_command_failure = _application_helpers.report_command_failure
+_report_game_launch_cancelled = _application_helpers.report_game_launch_cancelled
+_failure_stage = _application_helpers.failure_stage
+def _doctor(as_json: bool) -> int:
+	return _health_commands.doctor(sys.modules[__name__], as_json)
+
+
+def _container_host(repair: bool, as_json: bool) -> int:
+	return _health_commands.container_host(sys.modules[__name__], repair, as_json)
+
+
+_container_host_ok = _health_commands.container_host_ok
+
+
+def _container_host_startup_migration(paths: AppPaths) -> None:
+	_health_commands.container_host_startup_migration(sys.modules[__name__], paths)
+
+
+def _runtime_bootstrap(paths: AppPaths, as_json: bool) -> int:
+	return _health_commands.runtime_bootstrap(sys.modules[__name__], paths, as_json)
+
+
+def _login_diagnostics(
+	paths: AppPaths,
+	timeout_seconds: float,
+	runtime_choice: str,
+	as_json: bool,
+) -> int:
+	return _health_commands.login_diagnostics(
+		sys.modules[__name__],
+		paths,
+		timeout_seconds,
+		runtime_choice,
+		as_json,
+	)
+
+def _fetch(paths: AppPaths, dry_run: bool, as_json: bool) -> int:
+	return _installation_commands.fetch(
+		sys.modules[__name__],
+		paths,
+		dry_run,
+		as_json,
+	)
+
+
+def _setup(
+	paths: AppPaths,
+	dry_run: bool,
+	force_runtime: bool,
+	as_json: bool,
+) -> int:
+	return _installation_commands.setup(
+		sys.modules[__name__],
+		paths,
+		dry_run,
+		force_runtime,
+		as_json,
+	)
+
+
+def _native_update(
+	paths: AppPaths,
+	dry_run: bool,
+	repair: bool,
+	seed_from: Path | None,
+	no_import: bool,
+	as_json: bool,
+) -> int:
+	return _installation_commands.native_update(
+		sys.modules[__name__],
+		paths,
+		dry_run,
+		repair,
+		seed_from,
+		no_import,
+		as_json,
+	)
+
+
+def _wine_update(
+	paths: AppPaths,
+	dry_run: bool,
+	force_runtime: bool,
+	seed_from: Path | None,
+	no_import: bool,
+	as_json: bool,
+) -> int:
+	return _installation_commands.wine_update(
+		sys.modules[__name__],
+		paths,
+		dry_run,
+		force_runtime,
+		seed_from,
+		no_import,
+		as_json,
+	)
+
+
+def _configure_launcher_runtime(
+	paths: AppPaths,
+	tools: WineTools,
+	runner: CommandRunner,
+	*,
+	force_runtime: bool,
+) -> list[CommandOutcome]:
+	return _installation_commands.configure_launcher_runtime(
+		sys.modules[__name__],
+		paths,
+		tools,
+		runner,
+		force_runtime=force_runtime,
+	)
+
+
+_print_sync_progress = _installation_commands.print_sync_progress
+_configured_download_options = _installation_commands.configured_download_options
+_print_operation_status = _installation_commands.print_operation_status
+
+
+def _import_game(
+	paths: AppPaths,
+	source: Path,
+	dry_run: bool,
+	as_json: bool,
+) -> int:
+	return _installation_commands.import_game(
+		sys.modules[__name__],
+		paths,
+		source,
+		dry_run,
+		as_json,
+	)
+
+
+def _maybe_import_game(
+	paths: AppPaths,
+	settings: Settings,
+	seed_from: Path | None,
+	runner: CommandRunner,
+	*,
+	announce: bool,
+) -> GameImportResult | None:
+	return _installation_commands.maybe_import_game(
+		sys.modules[__name__],
+		paths,
+		settings,
+		seed_from,
+		runner,
+		announce=announce,
+	)
+
+
+def _import_with_telemetry(
+	paths: AppPaths,
+	source: Path,
+	runner: CommandRunner,
+) -> GameImportResult:
+	return _installation_commands.import_with_telemetry(
+		sys.modules[__name__],
+		paths,
+		source,
+		runner,
+	)
+
+
+def _prepare(paths: AppPaths, game_dir: Path | None, as_json: bool) -> int:
+	return _installation_commands.prepare(
+		sys.modules[__name__],
+		paths,
+		game_dir,
+		as_json,
+	)
+def _play(
+	paths: AppPaths,
+	game_dir: Path | None,
+	no_box: bool,
+	dry_run: bool,
+	skip_runtime_setup: bool,
+	as_json: bool,
+	*,
+	realm: str | None = None,
+) -> int:
+	return _play_commands.play(
+		sys.modules[__name__],
+		paths,
+		game_dir,
+		no_box,
+		dry_run,
+		skip_runtime_setup,
+		as_json,
+		realm=realm,
+	)
+
+
+def _play_locked(
+	paths: AppPaths,
+	game_dir: Path | None,
+	no_box: bool,
+	dry_run: bool,
+	skip_runtime_setup: bool,
+	as_json: bool,
+	*,
+	realm: str | None = None,
+	reuse_prepared: bool = False,
+	before_game: Callable[[], None] | None = None,
+	game_lease_fds: Sequence[int] = (),
+) -> int:
+	return _play_commands.play_locked(
+		sys.modules[__name__],
+		paths,
+		game_dir,
+		no_box,
+		dry_run,
+		skip_runtime_setup,
+		as_json,
+		realm=realm,
+		reuse_prepared=reuse_prepared,
+		before_game=before_game,
+		game_lease_fds=game_lease_fds,
+	)
+
+
+_session_duration_class = _play_commands.session_duration_class
+_game_exit_metadata = _play_commands.game_exit_metadata
+_signal_name = _play_commands.signal_name
+
+
+def _ensure_portable_umu_for_play(
+	paths: AppPaths,
+	settings: Settings,
+	*,
+	dry_run: bool,
+) -> UmuBootstrapResult | None:
+	return _play_commands.ensure_portable_umu_for_play(
+		sys.modules[__name__],
+		paths,
+		settings,
+		dry_run=dry_run,
+	)
+
+
+def _current_game_log(
+	directory: Path,
+	baseline: dict[str, LogFileState],
+	started_ns: int,
+	*,
+	managed_asset_paths: Sequence[str] | None = None,
+	source_game: Path | None = None,
+) -> dict[str, object] | None:
+	return _play_commands.current_game_log(
+		sys.modules[__name__],
+		directory,
+		baseline,
+		started_ns,
+		managed_asset_paths=managed_asset_paths,
+		source_game=source_game,
+	)
+
+
+def _current_game_crash(
+	directory: Path,
+	baseline: dict[str, LogFileState],
+	started_ns: int,
+) -> dict[str, object] | None:
+	return _play_commands.current_game_crash(
+		sys.modules[__name__],
+		directory,
+		baseline,
+		started_ns,
+	)
+
+
+_runtime_issue_summary = _play_commands.runtime_issue_summary
+_gamescope_presentation_failure = _play_commands.gamescope_presentation_failure
+_game_window_was_ready = _play_commands.game_window_was_ready
+_game_readiness_signal = _play_commands.game_readiness_signal
+_window_diagnostic_severity = _play_commands.window_diagnostic_severity
+_print_game_outcome = _play_commands.print_game_outcome
+_print_interrupted_game_log = _play_commands.print_interrupted_game_log
+_login_trace = _play_commands.login_trace
+def _settings(
+	paths: AppPaths,
+	initialize: bool,
+	reset: bool,
+	as_json: bool,
+) -> int:
+	return _settings_commands.settings(
+		sys.modules[__name__],
+		paths,
+		initialize,
+		reset,
+		as_json,
+	)
+
+
+def _launcher_update(
+	paths: AppPaths,
+	check_only: bool,
+	verify: bool,
+	rollback: str | bool | None,
+	manifest_url: str | None,
+	public_key: Path | None,
+	as_json: bool,
+	*,
+	history_url: str | None = None,
+) -> int:
+	return _launcher_update_commands.launcher_update(
+		sys.modules[__name__],
+		paths,
+		check_only,
+		verify,
+		rollback,
+		manifest_url,
+		public_key,
+		as_json,
+		history_url=history_url,
+	)
+def _source_game(
+	paths: AppPaths,
+	_settings: Settings,
+	argument: Path | None,
+) -> Path:
+	"""Select the managed game unless an explicit diagnostic path was supplied.
+
+	The persisted ``game_source`` setting is an import seed only. It must not
+	redirect normal Play, Prepare, or Login Trace operations away from the
+	launcher-managed tree.
+	"""
+
+	if argument is not None:
+		return argument.expanduser().resolve()
+	return paths.source_game
+
+
+def _load_or_default_settings(paths: AppPaths, *, persist: bool) -> Settings:
+	if paths.settings_file.is_file():
+		return load_settings(paths)
+	if persist:
+		return ensure_settings(paths)
+	return Settings()
+
+
+def _runner(paths: AppPaths, operation: str, dry_run: bool) -> CommandRunner:
+	timestamp = datetime.now().astimezone().strftime("%Y%m%d-%H%M%S-%f")
+	return CommandRunner(
+		paths.logs / f"{timestamp}-{operation}.jsonl",
+		dry_run=dry_run,
+		operation=operation,
+	)
+
+
+def _play_guard(
+	paths: AppPaths,
+	dry_run: bool,
+) -> AbstractContextManager[LauncherPlayLease]:
+	if dry_run:
+		return nullcontext(LauncherPlayLease.dry_run())
+	return launcher_play_lock(
+		paths.launcher_operation_lock,
+		active_game_probe=lambda: _managed_game_process_is_active(paths),
+	)
+
+
+def _operation_guard(
+	paths: AppPaths,
+	operation: str,
+	dry_run: bool,
+) -> AbstractContextManager[None]:
+	if dry_run:
+		return nullcontext()
+	return launcher_operation_lock(
+		paths.launcher_operation_lock,
+		operation,
+		active_game_probe=lambda: _managed_game_process_is_active(paths),
+	)
+
+
+def _managed_game_process_is_active(paths: AppPaths) -> bool:
+	return managed_game_process_is_active(
+		paths.runtime_view,
+		(paths.proton_prefix, paths.umu_prefix),
+	)
+
+
+def _emit(value: object, as_json: bool) -> None:
+	_application_helpers.emit(value, as_json, json_printer=_print_json)
+
+
+def _print_json(value: object) -> None:
+	_application_helpers.print_json(value)

src/ptlinux/command.py

@@ -342,15 +342,22 @@ def _finish_stream_relays(
 	stdout_thread: threading.Thread,
 	stderr_thread: threading.Thread,
 ) -> None:
-	"""Bound relay cleanup so a second interrupt can never be required."""
+	"""Bound relay cleanup even when an orphan inherits the output pipes."""
 
 	stdout_thread.join(timeout=2.0)
 	stderr_thread.join(timeout=2.0)
-	for stream in (process.stdout, process.stderr):
+	for stream, relay_thread in (
-		if stream is not None:
+		(process.stdout, stdout_thread),
+		(process.stderr, stderr_thread),
+	):
+		# TextIOWrapper.close() waits for an active reader's internal lock. Wine
+		# and Gamescope helpers can outlive their direct parent while retaining a
+		# standard-output descriptor, leaving readline() blocked even though the
+		# supervised process has exited. The play command itself is short-lived,
+		# so let its daemon relay leave with the process instead of blocking the
+		# game-completion event indefinitely.
+		if stream is not None and not relay_thread.is_alive():
 			try:
 				stream.close()
 			except OSError:
 				pass
-	stdout_thread.join(timeout=0.25)
-	stderr_thread.join(timeout=0.25)

src/ptlinux/diagnostics/__init__.py

@@ -0,0 +1 @@
+"""Launcher-owned diagnostic parsing used by CLI and runtime workflows."""

src/ptlinux/game/__init__.py

@@ -0,0 +1 @@
+"""Launcher-owned game data, synchronization, and compatibility services."""

src/ptlinux/game/compatibility/__init__.py

@@ -0,0 +1 @@
+"""Verified compatibility transforms for publisher game data."""

src/ptlinux/game/depot/__init__.py

@@ -0,0 +1,87 @@
+"""Public models for the verified game-depot feature."""
+
+from .catalogs import launch_catalog_from_snapshot, select_depot_start_option
+from .filesystem import (
+	apply_create_if_missing,
+	apply_deletions,
+	ensure_target_parent,
+	quarantine_unmanaged_files,
+	recover_crlf_manifest_file,
+	safe_imported_user_file,
+	write_json,
+)
+from .integrity import (
+	build_depot_file_catalog,
+	inspect_managed_game,
+	plan_update,
+)
+from .manifest import parse_snapshot
+from .models import (
+	DEFAULT_DEPOT_START_OPTION,
+	CreateIfMissing,
+	DepotDownloadMetrics,
+	DepotError,
+	DepotFile,
+	DepotFileCatalog,
+	DepotFileCatalogEntry,
+	DepotIntegrityIssue,
+	DepotLaunchCatalog,
+	DepotPreflightResult,
+	DepotSnapshot,
+	DepotStartOption,
+	DepotSyncResult,
+	PlannedDownload,
+	ProgressCallback,
+	QuarantineResult,
+	SyncProgress,
+	UpdatePlan,
+)
+from .transfer import (
+	AdaptiveConcurrencyController,
+	BandwidthLimiter,
+	DepotHttpClient,
+	DownloadTelemetry,
+	HttpOpener,
+	HttpResponse,
+)
+
+
+__all__ = [
+	"DEFAULT_DEPOT_START_OPTION",
+	"AdaptiveConcurrencyController",
+	"BandwidthLimiter",
+	"CreateIfMissing",
+	"DepotDownloadMetrics",
+	"DepotError",
+	"DepotFile",
+	"DepotFileCatalog",
+	"DepotFileCatalogEntry",
+	"DepotHttpClient",
+	"DepotIntegrityIssue",
+	"DepotLaunchCatalog",
+	"DepotPreflightResult",
+	"DepotSnapshot",
+	"DepotStartOption",
+	"DepotSyncResult",
+	"DownloadTelemetry",
+	"HttpOpener",
+	"HttpResponse",
+	"PlannedDownload",
+	"ProgressCallback",
+	"QuarantineResult",
+	"SyncProgress",
+	"UpdatePlan",
+	"apply_create_if_missing",
+	"apply_deletions",
+	"build_depot_file_catalog",
+	"ensure_target_parent",
+	"inspect_managed_game",
+	"launch_catalog_from_snapshot",
+	"plan_update",
+	"parse_snapshot",
+	"quarantine_unmanaged_files",
+	"recover_crlf_manifest_file",
+	"safe_imported_user_file",
+	"select_depot_start_option",
+	"write_json",
+]

src/ptlinux/game/depot/catalogs.py

@@ -0,0 +1,208 @@
+"""Pure serialization and strict parsing for cached depot catalogs."""
+
+from __future__ import annotations
+
+from dataclasses import asdict
+
+from .manifest import (
+	SHA1_PATTERN,
+	non_negative_int,
+	normalize_relative_path,
+	parse_start_options,
+	positive_int,
+	required_string,
+)
+from .models import (
+	DEFAULT_DEPOT_START_OPTION,
+	DepotError,
+	DepotFileCatalog,
+	DepotFileCatalogEntry,
+	DepotLaunchCatalog,
+	DepotSnapshot,
+	DepotStartOption,
+)
+from .realms import launcher_launch_catalog, launcher_realm_name
+
+
+DEPOT_LAUNCH_CATALOG_SCHEMA = 1
+DEPOT_FILE_CATALOG_SCHEMA = 1
+
+
+def launch_catalog_from_snapshot(snapshot: DepotSnapshot) -> DepotLaunchCatalog:
+	return launcher_launch_catalog(
+		DepotLaunchCatalog(
+			build=snapshot.build,
+			start_options=snapshot.start_options,
+			default_start_option=snapshot.default_start_option,
+		)
+	)
+
+
+def select_depot_start_option(
+	catalog: DepotLaunchCatalog | None,
+	preferred_realm: str | None = None,
+) -> DepotStartOption:
+	"""Choose a published realm, falling back to Babel when possible."""
+
+	current = launcher_launch_catalog(
+		catalog
+		or DepotLaunchCatalog(
+			build=0,
+			start_options=(DEFAULT_DEPOT_START_OPTION,),
+			default_start_option=DEFAULT_DEPOT_START_OPTION.name,
+		)
+	)
+	if preferred_realm:
+		preferred_names = {
+			preferred_realm.casefold(),
+			launcher_realm_name(preferred_realm).casefold(),
+		}
+		for option in current.start_options:
+			if option.name.casefold() in preferred_names:
+				return option
+	for option in current.start_options:
+		if option.name.casefold() == DEFAULT_DEPOT_START_OPTION.name.casefold():
+			return option
+	for option in current.start_options:
+		if option.name.casefold() == current.default_start_option.casefold():
+			return option
+	return current.start_options[0]
+
+
+def launch_catalog_payload(snapshot: DepotSnapshot) -> dict[str, object]:
+	catalog = launch_catalog_from_snapshot(snapshot)
+	return {
+		"schema": DEPOT_LAUNCH_CATALOG_SCHEMA,
+		"build": catalog.build,
+		"default_start_option": catalog.default_start_option,
+		"start_options": [asdict(option) for option in catalog.start_options],
+	}
+
+
+def parse_launch_catalog(value: object) -> DepotLaunchCatalog | None:
+	if not isinstance(value, dict):
+		return None
+	if value.get("schema") != DEPOT_LAUNCH_CATALOG_SCHEMA:
+		return None
+	build = positive_int(value.get("build"), "cached depot build")
+	raw_options = value.get("start_options")
+	if not isinstance(raw_options, list):
+		return None
+	manifest_options = [
+		{
+			"Name": item.get("name"),
+			"Path": item.get("path"),
+			"Arguments": item.get("arguments"),
+		}
+		if isinstance(item, dict)
+		else item
+		for item in raw_options
+	]
+	options, default_name = parse_start_options(
+		manifest_options,
+		value.get("default_start_option"),
+	)
+	return launcher_launch_catalog(
+		DepotLaunchCatalog(
+			build=build,
+			start_options=options,
+			default_start_option=default_name,
+		)
+	)
+
+
+def depot_file_catalog_payload(catalog: DepotFileCatalog) -> dict[str, object]:
+	"""Use compact rows because this cache contains tens of thousands of files."""
+
+	return {
+		"schema": DEPOT_FILE_CATALOG_SCHEMA,
+		"build": catalog.build,
+		"created_at": catalog.created_at,
+		"files": [
+			[
+				entry.path,
+				entry.size,
+				entry.sha1,
+				entry.device,
+				entry.inode,
+				entry.mtime_ns,
+				entry.ctime_ns,
+				entry.verified,
+			]
+			for entry in catalog.files
+		],
+	}
+
+
+def parse_depot_file_catalog_entry(value: object) -> DepotFileCatalogEntry:
+	if not isinstance(value, list) or len(value) != 8:
+		raise DepotError("cached depot file entry must be an eight-value row")
+	path = normalize_relative_path(value[0], "cached depot file path")
+	size = non_negative_int(value[1], f"cached depot file size for {path}")
+	sha1 = required_string(value[2], f"cached depot file hash for {path}").casefold()
+	if not SHA1_PATTERN.fullmatch(sha1):
+		raise DepotError(f"invalid cached SHA-1 hash for {path}")
+	identity: dict[str, int] = {}
+	for field_name, field_value in zip(
+		("device", "inode", "mtime_ns", "ctime_ns"),
+		value[3:7],
+		strict=True,
+	):
+		identity[field_name] = non_negative_int(
+			field_value,
+			f"cached depot file {field_name} for {path}",
+		)
+	verified = value[7]
+	if not isinstance(verified, bool):
+		raise DepotError(f"cached depot verification flag is invalid for {path}")
+	return DepotFileCatalogEntry(
+		path=path,
+		size=size,
+		sha1=sha1,
+		device=identity["device"],
+		inode=identity["inode"],
+		mtime_ns=identity["mtime_ns"],
+		ctime_ns=identity["ctime_ns"],
+		verified=verified,
+	)
+
+
+def parse_depot_file_catalog(value: object) -> DepotFileCatalog | None:
+	if not isinstance(value, dict):
+		return None
+	if value.get("schema") != DEPOT_FILE_CATALOG_SCHEMA:
+		return None
+	build = positive_int(value.get("build"), "cached depot file build")
+	created_at = required_string(
+		value.get("created_at"),
+		"cached depot file timestamp",
+	)
+	raw_files = value.get("files")
+	if not isinstance(raw_files, list):
+		return None
+	entries: list[DepotFileCatalogEntry] = []
+	seen: set[str] = set()
+	for raw in raw_files:
+		entry = parse_depot_file_catalog_entry(raw)
+		if entry.path.casefold() in seen:
+			return None
+		seen.add(entry.path.casefold())
+		entries.append(entry)
+	return DepotFileCatalog(
+		build=build,
+		files=tuple(entries),
+		created_at=created_at,
+	)
+
+
+__all__ = [
+	"DEPOT_FILE_CATALOG_SCHEMA",
+	"DEPOT_LAUNCH_CATALOG_SCHEMA",
+	"depot_file_catalog_payload",
+	"launch_catalog_from_snapshot",
+	"launch_catalog_payload",
+	"parse_depot_file_catalog",
+	"parse_depot_file_catalog_entry",
+	"parse_launch_catalog",
+	"select_depot_start_option",
+]

src/ptlinux/game/depot/filesystem.py

@@ -0,0 +1,338 @@
+"""Filesystem mutation and quarantine operations for the game depot."""
+
+from __future__ import annotations
+
+from datetime import datetime
+import hashlib
+import json
+import os
+from pathlib import Path, PurePosixPath
+import stat
+from typing import Callable, Iterable
+from uuid import uuid4
+
+from .integrity import prepare_game_root, safe_target
+from .manifest import decode_create_if_missing
+from .models import CreateIfMissing, DepotError, DepotFile, DepotSnapshot, QuarantineResult
+
+
+DEFAULT_MAX_LINE_ENDING_RECOVERY_BYTES = 1024 * 1024
+DEFAULT_UNMANAGED_EXECUTABLE_SUFFIXES = frozenset(
+	{
+		".asi",
+		".bat",
+		".cmd",
+		".com",
+		".cpl",
+		".desktop",
+		".dll",
+		".drv",
+		".exe",
+		".jar",
+		".js",
+		".lnk",
+		".lua",
+		".msi",
+		".ocx",
+		".ps1",
+		".py",
+		".reg",
+		".scr",
+		".sh",
+		".so",
+		".url",
+		".vbe",
+		".vbs",
+		".wsf",
+	}
+)
+
+
+def quarantine_unmanaged_files(
+	source_game: Path,
+	quarantine_base: Path,
+	data_root: Path,
+	snapshot: DepotSnapshot,
+	*,
+	unmanaged_executable_suffixes: frozenset[str] = (
+		DEFAULT_UNMANAGED_EXECUTABLE_SUFFIXES
+	),
+	prepare_root: Callable[..., Path] = prepare_game_root,
+	safe_user_file: Callable[[Path, str], bool] | None = None,
+	write_manifest: Callable[[Path, object], None] | None = None,
+	clock: Callable[[], datetime] | None = None,
+	identifier: Callable[[], str] | None = None,
+) -> QuarantineResult:
+	"""Move non-depot import contents aside without following links."""
+
+	root = prepare_root(source_game, create=False)
+	if not root.exists():
+		return QuarantineResult(0, None)
+	allowed = {file.path for file in snapshot.files} | {
+		entry.path for entry in snapshot.create_if_missing
+	}
+	candidates: list[tuple[Path, str]] = []
+	user_file_is_safe = safe_user_file or (
+		lambda candidate_path, candidate_relative: safe_imported_user_file(
+			candidate_path,
+			candidate_relative,
+			executable_suffixes=unmanaged_executable_suffixes,
+		)
+	)
+
+	def walk_error(error: OSError) -> None:
+		raise DepotError(f"cannot inspect imported game tree: {error}") from error
+
+	for directory, directory_names, file_names in os.walk(
+		root,
+		topdown=True,
+		followlinks=False,
+		onerror=walk_error,
+	):
+		parent = Path(directory)
+		for name in tuple(directory_names):
+			path = parent / name
+			try:
+				status = path.lstat()
+			except OSError as exc:
+				raise DepotError(
+					f"cannot inspect imported entry {path}: {exc}"
+				) from exc
+			if stat.S_ISDIR(status.st_mode):
+				continue
+			directory_names.remove(name)
+			candidates.append((path, path.relative_to(root).as_posix()))
+		for name in file_names:
+			path = parent / name
+			relative = path.relative_to(root).as_posix()
+			try:
+				status = path.lstat()
+			except OSError as exc:
+				raise DepotError(
+					f"cannot inspect imported entry {path}: {exc}"
+				) from exc
+			if not stat.S_ISREG(status.st_mode):
+				candidates.append((path, relative))
+				continue
+			if relative in allowed:
+				continue
+			if user_file_is_safe(path, relative):
+				continue
+			candidates.append((path, relative))
+
+	if not candidates:
+		return QuarantineResult(0, None)
+	base = quarantine_base.resolve(strict=False)
+	resolved_data_root = data_root.resolve(strict=False)
+	try:
+		base.relative_to(resolved_data_root)
+	except ValueError as exc:
+		raise DepotError(f"import quarantine is outside the data root: {base}") from exc
+	now = clock or (lambda: datetime.now().astimezone())
+	new_identifier = identifier or (lambda: uuid4().hex)
+	stamp = now().strftime("%Y%m%d-%H%M%S")
+	quarantine = base / f"{stamp}-{new_identifier()}"
+	files_root = quarantine / "files"
+	files_root.mkdir(parents=True, exist_ok=False)
+	manifest = {
+		"schema": 1,
+		"complete": False,
+		"created_at": now().isoformat(),
+		"source": str(root),
+		"files": [relative for _path, relative in candidates],
+	}
+	write = write_manifest or write_json
+	write(quarantine / "quarantine.json", manifest)
+	for source, relative in candidates:
+		destination = files_root.joinpath(*PurePosixPath(relative).parts)
+		destination.parent.mkdir(parents=True, exist_ok=True)
+		try:
+			source.replace(destination)
+		except OSError as exc:
+			raise DepotError(
+				f"could not quarantine imported entry {relative}: {exc}"
+			) from exc
+	manifest["complete"] = True
+	write(quarantine / "quarantine.json", manifest)
+	return QuarantineResult(len(candidates), str(quarantine))
+
+
+def safe_imported_user_file(
+	path: Path,
+	relative: str,
+	*,
+	executable_suffixes: frozenset[str] = DEFAULT_UNMANAGED_EXECUTABLE_SUFFIXES,
+) -> bool:
+	"""Return whether an unmanaged save entry is safe to leave in place."""
+
+	parts = PurePosixPath(relative).parts
+	if not parts or parts[0].casefold() != "save":
+		return False
+	if path.suffix.casefold() in executable_suffixes:
+		return False
+	try:
+		with path.open("rb") as handle:
+			prefix = handle.read(4)
+	except OSError as exc:
+		raise DepotError(f"cannot inspect imported user file {path}: {exc}") from exc
+	return not (
+		prefix.startswith(b"MZ")
+		or prefix.startswith(b"\x7fELF")
+		or prefix.startswith(b"#!")
+	)
+
+
+def apply_deletions(
+	root: Path,
+	relative_paths: Iterable[str],
+	*,
+	target_for: Callable[[Path, str], Path] = safe_target,
+) -> int:
+	"""Delete publisher-retired files and links within the managed root."""
+
+	deleted = 0
+	for relative_path in relative_paths:
+		target = target_for(root, relative_path)
+		if target.is_symlink() or target.is_file():
+			target.unlink()
+			deleted += 1
+	return deleted
+
+
+def apply_create_if_missing(
+	root: Path,
+	entries: Iterable[CreateIfMissing],
+	*,
+	target_for: Callable[[Path, str], Path] = safe_target,
+	decode_entry: Callable[[CreateIfMissing], bytes] = decode_create_if_missing,
+	ensure_parent: Callable[[Path, Path], None] | None = None,
+	identifier: Callable[[], str] | None = None,
+) -> int:
+	"""Atomically create publisher defaults while preserving existing files."""
+
+	created = 0
+	prepare_parent = ensure_parent or ensure_target_parent
+	new_identifier = identifier or (lambda: uuid4().hex)
+	for entry in entries:
+		target = target_for(root, entry.path)
+		if target.is_symlink():
+			raise DepotError(f"refusing to follow symbolic link for {entry.path}")
+		if target.exists():
+			continue
+		content = decode_entry(entry)
+		prepare_parent(root, target)
+		temporary = target.with_name(f".{target.name}.{new_identifier()}.partial")
+		try:
+			with temporary.open("xb") as handle:
+				handle.write(content)
+				handle.flush()
+				os.fsync(handle.fileno())
+			temporary.replace(target)
+		except BaseException:
+			temporary.unlink(missing_ok=True)
+			raise
+		created += 1
+	return created
+
+
+def recover_crlf_manifest_file(
+	temporary: Path,
+	destination: Path,
+	file: DepotFile,
+	*,
+	maximum_bytes: int = DEFAULT_MAX_LINE_ENDING_RECOVERY_BYTES,
+	process_id: Callable[[], int] = os.getpid,
+	identifier: Callable[[], str] | None = None,
+) -> bool:
+	"""Restore publisher-normalized legacy text only on an exact hash match."""
+
+	try:
+		if temporary.stat().st_size > maximum_bytes:
+			return False
+		data = temporary.read_bytes()
+	except OSError as exc:
+		raise DepotError(f"could not inspect downloaded {file.path}: {exc}") from exc
+	if b"\r" in data:
+		return False
+	recovered = data.replace(b"\n", b"\r\n")
+	if len(recovered) != file.size:
+		return False
+	if (
+		hashlib.sha1(recovered, usedforsecurity=False).hexdigest().casefold()
+		!= file.sha1.casefold()
+	):
+		return False
+	new_identifier = identifier or (lambda: uuid4().hex)
+	recovered_temporary = destination.with_name(
+		f".{destination.name}.{process_id()}.{new_identifier()}.recovered"
+	)
+	try:
+		with recovered_temporary.open("xb") as handle:
+			handle.write(recovered)
+			handle.flush()
+			os.fsync(handle.fileno())
+		recovered_temporary.replace(destination)
+	except BaseException:
+		recovered_temporary.unlink(missing_ok=True)
+		raise
+	return True
+
+
+def ensure_target_parent(root: Path, target: Path) -> None:
+	"""Create a target's parent directories without traversing symlinks."""
+
+	try:
+		relative_parent = target.parent.relative_to(root)
+	except ValueError as exc:
+		raise DepotError(f"target escapes managed game directory: {target}") from exc
+	cursor = root
+	for part in relative_parent.parts:
+		cursor = cursor / part
+		if cursor.is_symlink():
+			raise DepotError(f"refusing to traverse symbolic link in game tree: {cursor}")
+		if cursor.exists():
+			if not cursor.is_dir():
+				raise DepotError(f"cannot create game directory over file: {cursor}")
+		else:
+			try:
+				cursor.mkdir()
+			except FileExistsError:
+				if cursor.is_symlink():
+					raise DepotError(
+						f"refusing to traverse symbolic link in game tree: {cursor}"
+					)
+				if not cursor.is_dir():
+					raise DepotError(f"cannot create game directory over file: {cursor}")
+			except OSError as exc:
+				raise DepotError(f"cannot create game directory {cursor}: {exc}") from exc
+
+
+def write_json(path: Path, value: object, *, compact: bool = False) -> None:
+	"""Atomically serialize one JSON document beside its destination."""
+
+	path.parent.mkdir(parents=True, exist_ok=True)
+	temporary = path.with_name(f".{path.name}.{os.getpid()}.tmp")
+	try:
+		payload = (
+			json.dumps(value, separators=(",", ":"), sort_keys=True)
+			if compact
+			else json.dumps(value, indent=2, sort_keys=True)
+		)
+		temporary.write_text(payload + "\n", encoding="utf-8")
+		temporary.replace(path)
+	except BaseException:
+		temporary.unlink(missing_ok=True)
+		raise
+
+
+__all__ = [
+	"DEFAULT_MAX_LINE_ENDING_RECOVERY_BYTES",
+	"DEFAULT_UNMANAGED_EXECUTABLE_SUFFIXES",
+	"apply_create_if_missing",
+	"apply_deletions",
+	"ensure_target_parent",
+	"quarantine_unmanaged_files",
+	"recover_crlf_manifest_file",
+	"safe_imported_user_file",
+	"write_json",
+]

src/ptlinux/game/depot/integrity.py

@@ -0,0 +1,413 @@
+"""Read-only update planning and managed-game integrity inspection."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import datetime
+import hashlib
+import os
+from pathlib import Path, PurePosixPath
+import stat
+import time
+from typing import Callable, Iterable
+
+from .manifest import relative_parts
+from .models import (
+	DepotError,
+	DepotFile,
+	DepotFileCatalog,
+	DepotFileCatalogEntry,
+	DepotIntegrityIssue,
+	DepotPreflightResult,
+	DepotSnapshot,
+	PlannedDownload,
+	UpdatePlan,
+)
+
+
+HashFile = Callable[[Path], str]
+Clock = Callable[[], float]
+
+
+@dataclass(frozen=True)
+class ScannedGameEntry:
+	path: Path
+	state: os.stat_result
+	kind: str
+
+
+def sha1_file(path: Path, *, read_size: int = 1024 * 1024) -> str:
+	digest = hashlib.sha1(usedforsecurity=False)
+	try:
+		with path.open("rb") as handle:
+			for chunk in iter(lambda: handle.read(read_size), b""):
+				digest.update(chunk)
+	except OSError as exc:
+		raise DepotError(f"cannot hash {path}: {exc}") from exc
+	return digest.hexdigest()
+
+
+def prepare_game_root(game_directory: Path, *, create: bool) -> Path:
+	root = game_directory.expanduser()
+	if root.is_symlink():
+		raise DepotError(f"managed game directory must not be a symbolic link: {root}")
+	if root.exists() and not root.is_dir():
+		raise DepotError(f"managed game path is not a directory: {root}")
+	if create:
+		root.mkdir(parents=True, exist_ok=True)
+	return root.resolve(strict=False)
+
+
+def safe_target(root: Path, relative_path: str) -> Path:
+	parts = relative_parts(relative_path, "depot path")
+	target = root.joinpath(*parts)
+	try:
+		target.resolve(strict=False).relative_to(root)
+	except ValueError as exc:
+		raise DepotError(
+			f"depot path escapes the managed game directory: {relative_path}"
+		) from exc
+	return target
+
+
+def scan_game_tree(root: Path) -> dict[str, ScannedGameEntry]:
+	"""Inventory files without following symlinks or resolving every manifest path."""
+
+	entries: dict[str, ScannedGameEntry] = {}
+
+	def scan(directory: Path, relative_parent: PurePosixPath) -> None:
+		children = scan_directory(directory)
+		for child in children:
+			relative = relative_parent / child.name
+			key = relative.as_posix()
+			try:
+				state = child.stat(follow_symlinks=False)
+			except OSError as exc:
+				raise DepotError(
+					f"cannot inspect managed game path {key}: {exc}"
+				) from exc
+			path = Path(child.path)
+			if stat.S_ISLNK(state.st_mode):
+				entries[key] = ScannedGameEntry(path, state, "symbolic link")
+			elif stat.S_ISDIR(state.st_mode):
+				scan(path, relative)
+			elif stat.S_ISREG(state.st_mode):
+				entries[key] = ScannedGameEntry(path, state, "file")
+			else:
+				entries[key] = ScannedGameEntry(path, state, "not a regular file")
+
+	scan(root, PurePosixPath())
+	return entries
+
+
+def scan_directory(directory: Path) -> list[os.DirEntry[str]]:
+	try:
+		with os.scandir(directory) as iterator:
+			return list(iterator)
+	except OSError as exc:
+		raise DepotError(f"cannot scan managed game directory {directory}: {exc}") from exc
+
+
+def catalog_entry(
+	file: DepotFile,
+	state: os.stat_result,
+	*,
+	verified: bool,
+) -> DepotFileCatalogEntry:
+	return DepotFileCatalogEntry(
+		path=file.path,
+		size=file.size,
+		sha1=file.sha1.casefold(),
+		device=state.st_dev,
+		inode=state.st_ino,
+		mtime_ns=state.st_mtime_ns,
+		ctime_ns=state.st_ctime_ns,
+		verified=verified,
+	)
+
+
+def catalog_entry_from_cached(
+	entry: DepotFileCatalogEntry,
+	state: os.stat_result,
+) -> DepotFileCatalogEntry:
+	return DepotFileCatalogEntry(
+		path=entry.path,
+		size=entry.size,
+		sha1=entry.sha1,
+		device=state.st_dev,
+		inode=state.st_ino,
+		mtime_ns=state.st_mtime_ns,
+		ctime_ns=state.st_ctime_ns,
+		verified=True,
+	)
+
+
+def catalog_identity_matches(
+	entry: DepotFileCatalogEntry,
+	state: os.stat_result,
+) -> bool:
+	return (
+		entry.device == state.st_dev
+		and entry.inode == state.st_ino
+		and entry.size == state.st_size
+		and entry.mtime_ns == state.st_mtime_ns
+		and entry.ctime_ns == state.st_ctime_ns
+	)
+
+
+def build_depot_file_catalog(
+	game_directory: Path,
+	snapshot: DepotSnapshot,
+	*,
+	verified_paths: Iterable[str],
+	previous: DepotFileCatalog | None = None,
+	created_at: str | None = None,
+) -> DepotFileCatalog:
+	"""Build an identity catalog without rehashing updater-verified files."""
+
+	root = prepare_game_root(game_directory, create=False)
+	scanned_files = scan_game_tree(root)
+	explicitly_verified = {
+		verified_path.casefold() for verified_path in verified_paths
+	}
+	previous_files = (
+		{entry.path.casefold(): entry for entry in previous.files}
+		if previous is not None
+		else {}
+	)
+	entries: list[DepotFileCatalogEntry] = []
+	for file in snapshot.files:
+		scanned = scanned_files.get(file.path)
+		if scanned is None:
+			raise DepotError(
+				f"cannot cache missing depot file identity: {file.path}"
+			)
+		state = scanned.state
+		if scanned.kind != "file" or state.st_size != file.size:
+			raise DepotError(
+				f"cannot cache invalid depot file identity: {file.path}"
+			)
+		prior = previous_files.get(file.path.casefold())
+		verified = file.path.casefold() in explicitly_verified
+		if (
+			not verified
+			and prior is not None
+			and prior.verified
+			and prior.size == file.size
+			and prior.sha1 == file.sha1
+			and catalog_identity_matches(prior, state)
+		):
+			verified = True
+		entries.append(catalog_entry(file, state, verified=verified))
+
+	return DepotFileCatalog(
+		build=snapshot.build,
+		files=tuple(entries),
+		created_at=(
+			created_at
+			if created_at is not None
+			else datetime.now().astimezone().isoformat()
+		),
+	)
+
+
+def plan_update(
+	game_directory: Path,
+	snapshot: DepotSnapshot,
+	*,
+	repair: bool = False,
+	hash_file: HashFile = sha1_file,
+	always_verify_paths: frozenset[str] = frozenset(
+		{"game.exe", "game.dll", "gamese.exe", "gamese.dll"}
+	),
+) -> UpdatePlan:
+	"""Inspect a local game tree without writing to it."""
+
+	root = prepare_game_root(game_directory, create=False)
+	downloads: list[PlannedDownload] = []
+	hash_verified_paths: list[str] = []
+	for file in snapshot.files:
+		target = safe_target(root, file.path)
+		if target.is_symlink():
+			downloads.append(PlannedDownload(file, "symbolic link"))
+			continue
+		if not target.is_file():
+			downloads.append(PlannedDownload(file, "missing"))
+			continue
+		try:
+			if target.stat().st_size != file.size:
+				downloads.append(PlannedDownload(file, "size mismatch"))
+				continue
+		except OSError as exc:
+			raise DepotError(f"cannot inspect {file.path}: {exc}") from exc
+		if (
+			repair
+			or file.build == snapshot.build
+			or file.path.casefold() in always_verify_paths
+		):
+			if hash_file(target).casefold() != file.sha1.casefold():
+				downloads.append(PlannedDownload(file, "hash mismatch"))
+			else:
+				hash_verified_paths.append(file.path)
+
+	deletes: list[str] = []
+	for relative_path in snapshot.deleted_files:
+		target = safe_target(root, relative_path)
+		if target.is_symlink() or target.is_file():
+			deletes.append(relative_path)
+		elif target.exists():
+			raise DepotError(
+				f"refusing to delete non-file depot target: {relative_path}"
+			)
+
+	return UpdatePlan(
+		downloads=tuple(downloads),
+		deletes=tuple(deletes),
+		files_total=len(snapshot.files),
+		bytes_total=sum(item.file.size for item in downloads),
+		hash_verified_paths=tuple(hash_verified_paths),
+	)
+
+
+def inspect_managed_game(
+	game_directory: Path,
+	catalog: DepotFileCatalog,
+	*,
+	hash_file: HashFile = sha1_file,
+	max_issues: int = 32,
+	clock: Clock = time.perf_counter,
+) -> tuple[DepotPreflightResult, DepotFileCatalog | None]:
+	"""Inspect one catalog and return its report plus any refreshed identities."""
+
+	started = clock()
+	root = prepare_game_root(game_directory, create=False)
+	if not root.is_dir():
+		return (
+			DepotPreflightResult(
+				build=catalog.build,
+				files_total=len(catalog.files),
+				verified_files=0,
+				unverified_files=sum(
+					not entry.verified for entry in catalog.files
+				),
+				changed_files_hashed=0,
+				issue_count=1,
+				issues=(
+					DepotIntegrityIssue(
+						".",
+						"managed game directory is missing",
+					),
+				),
+				duration_ms=elapsed_milliseconds(started, clock),
+			),
+			None,
+		)
+	try:
+		scanned_files = scan_game_tree(root)
+	except DepotError as exc:
+		return (
+			DepotPreflightResult(
+				build=catalog.build,
+				files_total=len(catalog.files),
+				verified_files=0,
+				unverified_files=sum(
+					not entry.verified for entry in catalog.files
+				),
+				changed_files_hashed=0,
+				issue_count=1,
+				issues=(DepotIntegrityIssue(".", str(exc)),),
+				duration_ms=elapsed_milliseconds(started, clock),
+			),
+			None,
+		)
+
+	verified_files = 0
+	unverified_files = 0
+	changed_files_hashed = 0
+	issue_count = 0
+	issues: list[DepotIntegrityIssue] = []
+	updated_entries: list[DepotFileCatalogEntry] = []
+	cache_changed = False
+	for entry in catalog.files:
+		reason = None
+		state: os.stat_result | None = None
+		scanned = scanned_files.get(entry.path)
+		if scanned is None:
+			reason = "missing"
+		elif scanned.kind != "file":
+			reason = scanned.kind
+		elif scanned.state.st_size != entry.size:
+			reason = "size mismatch"
+		else:
+			state = scanned.state
+
+		updated_entry = entry
+		if reason is None and state is not None:
+			if not entry.verified:
+				unverified_files += 1
+			elif catalog_identity_matches(entry, state):
+				verified_files += 1
+			else:
+				changed_files_hashed += 1
+				try:
+					assert scanned is not None
+					matches = hash_file(scanned.path).casefold() == entry.sha1
+				except DepotError as exc:
+					reason = f"cannot verify changed file: {exc}"
+				else:
+					if matches:
+						verified_files += 1
+						updated_entry = catalog_entry_from_cached(entry, state)
+						cache_changed = True
+					else:
+						reason = "hash mismatch"
+
+		if reason is not None:
+			issue_count += 1
+			if len(issues) < max_issues:
+				issues.append(DepotIntegrityIssue(entry.path, reason))
+		updated_entries.append(updated_entry)
+
+	updated_catalog = (
+		DepotFileCatalog(
+			build=catalog.build,
+			files=tuple(updated_entries),
+			created_at=datetime.now().astimezone().isoformat(),
+		)
+		if cache_changed
+		else None
+	)
+	return (
+		DepotPreflightResult(
+			build=catalog.build,
+			files_total=len(catalog.files),
+			verified_files=verified_files,
+			unverified_files=unverified_files,
+			changed_files_hashed=changed_files_hashed,
+			issue_count=issue_count,
+			issues=tuple(issues),
+			duration_ms=elapsed_milliseconds(started, clock),
+		),
+		updated_catalog,
+	)
+
+
+def elapsed_milliseconds(started: float, clock: Clock = time.perf_counter) -> int:
+	return max(0, round((clock() - started) * 1000))
+
+
+__all__ = [
+	"HashFile",
+	"ScannedGameEntry",
+	"build_depot_file_catalog",
+	"catalog_entry",
+	"catalog_entry_from_cached",
+	"catalog_identity_matches",
+	"inspect_managed_game",
+	"plan_update",
+	"prepare_game_root",
+	"safe_target",
+	"scan_directory",
+	"scan_game_tree",
+	"sha1_file",
+]

src/ptlinux/game/depot/manifest.py

@@ -0,0 +1,279 @@
+"""Strict parsing for publisher depot manifests."""
+
+from __future__ import annotations
+
+from base64 import b64decode
+from binascii import Error as BinAsciiError
+from pathlib import PurePosixPath
+import re
+from typing import Mapping
+
+from .models import (
+	DEFAULT_DEPOT_START_OPTION,
+	CreateIfMissing,
+	DepotError,
+	DepotFile,
+	DepotSnapshot,
+	DepotStartOption,
+)
+
+
+MAX_CREATE_IF_MISSING_BYTES = 16 * 1024 * 1024
+SHA1_PATTERN = re.compile(r"^[0-9a-fA-F]{40}$")
+
+
+def parse_snapshot(
+	region: str,
+	server: str,
+	depot_manifest: Mapping[str, object],
+	build_manifest: Mapping[str, object],
+) -> DepotSnapshot:
+	"""Validate publisher manifests and return their canonical snapshot."""
+
+	build = positive_int(depot_manifest.get("Build"), "depot Build")
+	build_manifest_build = positive_int(build_manifest.get("b"), "build manifest b")
+	if build_manifest_build != build:
+		raise DepotError(
+			f"depot build {build} does not match build manifest {build_manifest_build}"
+		)
+	name = required_string(depot_manifest.get("Name"), "depot Name")
+	version = required_string(
+		depot_manifest.get("BuildVersionText"),
+		"depot BuildVersionText",
+	)
+	files_value = build_manifest.get("f")
+	if not isinstance(files_value, list):
+		raise DepotError("build manifest f must be an array")
+	files: list[DepotFile] = []
+	seen_paths: set[str] = set()
+	for value in files_value:
+		if not isinstance(value, dict):
+			raise DepotError("build manifest contains a non-object file entry")
+		path = normalize_relative_path(value.get("p"), "file path")
+		if path.casefold() in seen_paths:
+			raise DepotError(f"build manifest has duplicate file path: {path}")
+		seen_paths.add(path.casefold())
+		file_build = positive_int(value.get("b"), f"file build for {path}")
+		size = non_negative_int(value.get("s"), f"file size for {path}")
+		sha1 = required_string(value.get("h"), f"file hash for {path}")
+		if not SHA1_PATTERN.fullmatch(sha1):
+			raise DepotError(f"invalid SHA-1 hash for {path}")
+		files.append(DepotFile(path, file_build, size, sha1.casefold()))
+
+	deleted = parse_deleted_paths(build_manifest.get("df"), seen_paths)
+	create_if_missing = parse_create_if_missing(
+		depot_manifest.get("CreateIfMissing")
+	)
+	start_options, default_start_option = parse_start_options(
+		depot_manifest.get("StartOptions"),
+		depot_manifest.get("DefaultStartOption"),
+	)
+	canonical_file_paths = {file.path.casefold(): file.path for file in files}
+	start_options = tuple(
+		DepotStartOption(
+			name=option.name,
+			path=canonical_file_paths.get(option.path.casefold(), option.path),
+			arguments=option.arguments,
+		)
+		for option in start_options
+	)
+	return DepotSnapshot(
+		region=region,
+		server=server,
+		name=name,
+		build=build,
+		version=version,
+		files=tuple(files),
+		deleted_files=deleted,
+		create_if_missing=create_if_missing,
+		start_options=start_options,
+		default_start_option=default_start_option,
+	)
+
+
+def parse_deleted_paths(value: object, known_paths: set[str]) -> tuple[str, ...]:
+	if value is None:
+		return ()
+	if not isinstance(value, list):
+		raise DepotError("build manifest df must be an array")
+	paths: list[str] = []
+	seen: set[str] = set()
+	for item in value:
+		path = normalize_relative_path(item, "deleted file path")
+		folded = path.casefold()
+		if folded in known_paths:
+			raise DepotError(
+				f"manifest lists a file as both present and deleted: {path}"
+			)
+		if folded in seen:
+			continue
+		seen.add(folded)
+		paths.append(path)
+	return tuple(paths)
+
+
+def parse_create_if_missing(value: object) -> tuple[CreateIfMissing, ...]:
+	if value is None:
+		return ()
+	if not isinstance(value, list):
+		raise DepotError("CreateIfMissing must be an array")
+	entries: list[CreateIfMissing] = []
+	seen: set[str] = set()
+	for item in value:
+		if not isinstance(item, dict):
+			raise DepotError("CreateIfMissing contains a non-object entry")
+		path = normalize_relative_path(item.get("Path"), "CreateIfMissing path")
+		folded = path.casefold()
+		if folded in seen:
+			raise DepotError(f"CreateIfMissing has duplicate path: {path}")
+		seen.add(folded)
+		content = required_string(
+			item.get("Content"),
+			f"CreateIfMissing content for {path}",
+		)
+		entry = CreateIfMissing(path, content)
+		decode_create_if_missing(entry)
+		entries.append(entry)
+	return tuple(entries)
+
+
+def parse_start_options(
+	value: object,
+	default_value: object,
+) -> tuple[tuple[DepotStartOption, ...], str]:
+	"""Validate the launch targets published by the official depot manifest."""
+
+	if value is None:
+		return (DEFAULT_DEPOT_START_OPTION,), DEFAULT_DEPOT_START_OPTION.name
+	if not isinstance(value, list) or not value:
+		raise DepotError("StartOptions must be a non-empty array")
+	options: list[DepotStartOption] = []
+	seen_names: set[str] = set()
+	for item in value:
+		if not isinstance(item, dict):
+			raise DepotError("StartOptions contains a non-object entry")
+		name = start_option_text(item.get("Name"), "StartOptions Name", 64)
+		folded_name = name.casefold()
+		if folded_name in seen_names:
+			raise DepotError(f"StartOptions has duplicate realm name: {name}")
+		seen_names.add(folded_name)
+		path = normalize_relative_path(
+			item.get("Path"),
+			f"StartOptions path for {name}",
+		)
+		if PurePosixPath(path).suffix.casefold() != ".exe":
+			raise DepotError(
+				f"StartOptions path is not an executable for {name}: {path}"
+			)
+		arguments = start_option_text(
+			item.get("Arguments"),
+			f"StartOptions arguments for {name}",
+			2048,
+		)
+		options.append(DepotStartOption(name=name, path=path, arguments=arguments))
+
+	if default_value is None:
+		default_name = next(
+			(
+				option.name
+				for option in options
+				if option.name.casefold()
+				== DEFAULT_DEPOT_START_OPTION.name.casefold()
+			),
+			options[0].name,
+		)
+	else:
+		default_name = start_option_text(default_value, "DefaultStartOption", 64)
+		matching_default = next(
+			(
+				option.name
+				for option in options
+				if option.name.casefold() == default_name.casefold()
+			),
+			None,
+		)
+		if matching_default is None:
+			raise DepotError(
+				"DefaultStartOption does not match an advertised realm: "
+				f"{default_name}"
+			)
+		default_name = matching_default
+	return tuple(options), default_name
+
+
+def start_option_text(value: object, field: str, maximum_length: int) -> str:
+	if not isinstance(value, str):
+		raise DepotError(f"{field} must be a string")
+	text = value.strip()
+	if (
+		not text
+		or len(text) > maximum_length
+		or any(ord(character) < 32 for character in text)
+	):
+		raise DepotError(f"invalid {field}")
+	return text
+
+
+def decode_create_if_missing(entry: CreateIfMissing) -> bytes:
+	try:
+		content = b64decode(entry.content_base64, validate=True)
+	except (ValueError, BinAsciiError) as exc:
+		raise DepotError(
+			f"invalid base64 create-if-missing entry: {entry.path}"
+		) from exc
+	if len(content) > MAX_CREATE_IF_MISSING_BYTES:
+		raise DepotError(f"create-if-missing entry is too large: {entry.path}")
+	return content
+
+
+def normalize_relative_path(value: object, field: str) -> str:
+	if not isinstance(value, str):
+		raise DepotError(f"{field} must be a string")
+	return "/".join(relative_parts(value, field))
+
+
+def relative_parts(value: str, field: str) -> tuple[str, ...]:
+	if not value or "\x00" in value:
+		raise DepotError(f"invalid {field}")
+	normalized = value.replace("\\", "/")
+	if normalized.startswith("/") or normalized.startswith("//"):
+		raise DepotError(f"{field} must be relative: {value!r}")
+	parts = PurePosixPath(normalized).parts
+	if not parts or any(part in ("", ".", "..") or ":" in part for part in parts):
+		raise DepotError(f"invalid {field}: {value!r}")
+	return tuple(parts)
+
+
+def positive_int(value: object, field: str) -> int:
+	if isinstance(value, bool) or not isinstance(value, int) or value <= 0:
+		raise DepotError(f"{field} must be a positive integer")
+	return value
+
+
+def non_negative_int(value: object, field: str) -> int:
+	if isinstance(value, bool) or not isinstance(value, int) or value < 0:
+		raise DepotError(f"{field} must be a non-negative integer")
+	return value
+
+
+def required_string(value: object, field: str) -> str:
+	if not isinstance(value, str) or not value.strip():
+		raise DepotError(f"{field} must be a non-empty string")
+	return value
+
+
+__all__ = [
+	"MAX_CREATE_IF_MISSING_BYTES",
+	"SHA1_PATTERN",
+	"decode_create_if_missing",
+	"non_negative_int",
+	"normalize_relative_path",
+	"parse_create_if_missing",
+	"parse_deleted_paths",
+	"parse_snapshot",
+	"parse_start_options",
+	"positive_int",
+	"relative_parts",
+	"required_string",
+	"start_option_text",
+]

src/ptlinux/game/depot/models.py

@@ -0,0 +1,238 @@
+"""Immutable models and public validation errors for depot synchronization."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Callable
+
+
+class DepotError(RuntimeError):
+	"""Raised when a depot response or update operation cannot be trusted."""
+
+
+@dataclass(frozen=True)
+class DepotFile:
+	"""One exact file in the published depot build."""
+
+	path: str
+	build: int
+	size: int
+	sha1: str
+
+
+@dataclass(frozen=True)
+class CreateIfMissing:
+	"""A small publisher-provided file created only when absent."""
+
+	path: str
+	content_base64: str
+
+
+@dataclass(frozen=True)
+class DepotStartOption:
+	"""One publisher-advertised realm launch target."""
+
+	name: str
+	path: str
+	arguments: str
+
+
+DEFAULT_DEPOT_START_OPTION = DepotStartOption(
+	name="Babel",
+	path="Game.exe",
+	arguments="PTEU_REBORN",
+)
+
+
+@dataclass(frozen=True)
+class DepotSnapshot:
+	"""The current, verified shape of the public game depot."""
+
+	region: str
+	server: str
+	name: str
+	build: int
+	version: str
+	files: tuple[DepotFile, ...]
+	deleted_files: tuple[str, ...]
+	create_if_missing: tuple[CreateIfMissing, ...]
+	start_options: tuple[DepotStartOption, ...] = (DEFAULT_DEPOT_START_OPTION,)
+	default_start_option: str = DEFAULT_DEPOT_START_OPTION.name
+
+
+@dataclass(frozen=True)
+class DepotLaunchCatalog:
+	"""Small cached subset of a depot manifest needed for offline Play."""
+
+	build: int
+	start_options: tuple[DepotStartOption, ...]
+	default_start_option: str
+
+
+@dataclass(frozen=True)
+class DepotFileCatalogEntry:
+	"""One manifest file plus the identity recorded after verified installation."""
+
+	path: str
+	size: int
+	sha1: str
+	device: int
+	inode: int
+	mtime_ns: int
+	ctime_ns: int
+	verified: bool
+
+
+@dataclass(frozen=True)
+class DepotFileCatalog:
+	"""Cached manifest used for fast, network-free launch preflight checks."""
+
+	build: int
+	files: tuple[DepotFileCatalogEntry, ...]
+	created_at: str
+
+
+@dataclass(frozen=True)
+class DepotIntegrityIssue:
+	path: str
+	reason: str
+
+
+@dataclass(frozen=True)
+class DepotPreflightResult:
+	"""Outcome of validating cached file identities before starting the game."""
+
+	build: int
+	files_total: int
+	verified_files: int
+	unverified_files: int
+	changed_files_hashed: int
+	issue_count: int
+	issues: tuple[DepotIntegrityIssue, ...]
+	duration_ms: int
+
+	@property
+	def ready(self) -> bool:
+		return self.issue_count == 0
+
+	@property
+	def fully_verified(self) -> bool:
+		return self.ready and self.unverified_files == 0
+
+
+@dataclass(frozen=True)
+class PlannedDownload:
+	file: DepotFile
+	reason: str
+
+
+@dataclass(frozen=True)
+class UpdatePlan:
+	"""The safe changes needed to make a local tree match one depot snapshot."""
+
+	downloads: tuple[PlannedDownload, ...]
+	deletes: tuple[str, ...]
+	files_total: int
+	bytes_total: int
+	hash_verified_paths: tuple[str, ...] = ()
+
+
+@dataclass(frozen=True)
+class SyncProgress:
+	"""A thread-safe progress snapshot emitted by depot synchronization."""
+
+	phase: str
+	files_completed: int
+	files_total: int
+	bytes_completed: int
+	bytes_total: int
+	current_file: str | None
+	bytes_transferred: int = 0
+	bytes_remaining: int = 0
+	transfer_rate_bytes_per_second: float | None = None
+	eta_seconds: float | None = None
+	current_server: str | None = None
+	retry_count: int = 0
+	retry_reason: str | None = None
+	active_workers: int = 0
+	target_workers: int = 0
+
+
+@dataclass(frozen=True)
+class DepotSyncResult:
+	"""Persistent result of one native depot synchronization."""
+
+	region: str
+	server: str
+	name: str
+	build: int
+	version: str
+	files_total: int
+	files_downloaded: int
+	bytes_downloaded: int
+	files_deleted: int
+	files_created: int
+	files_quarantined: int
+	quarantine_directory: str | None
+	repair: bool
+	dry_run: bool
+	completed_at: str
+	files_planned: int = 0
+	bytes_planned: int = 0
+	manifest_duration_ms: int = 0
+	scan_duration_ms: int = 0
+	download_duration_ms: int = 0
+	apply_duration_ms: int = 0
+	update_duration_ms: int = 0
+	network_bytes_downloaded: int = 0
+	download_retry_count: int = 0
+	download_resume_used: bool = False
+	download_average_mbps: float | None = None
+	mirror_id: str | None = None
+
+
+@dataclass(frozen=True)
+class DepotDownloadMetrics:
+	"""Aggregate network measurements for one depot download phase."""
+
+	duration_ms: int = 0
+	transferred_bytes: int = 0
+	retry_count: int = 0
+	resume_used: bool = False
+	resumed_bytes: int = 0
+	average_mbps: float | None = None
+	mirror_id: str | None = None
+	http_status: int | None = None
+
+
+@dataclass(frozen=True)
+class QuarantineResult:
+	"""Recoverable unmanaged entries removed before authenticating an import."""
+
+	files: int
+	directory: str | None
+
+
+ProgressCallback = Callable[[SyncProgress], None]
+
+
+__all__ = [
+	"DEFAULT_DEPOT_START_OPTION",
+	"CreateIfMissing",
+	"DepotDownloadMetrics",
+	"DepotError",
+	"DepotFile",
+	"DepotFileCatalog",
+	"DepotFileCatalogEntry",
+	"DepotIntegrityIssue",
+	"DepotLaunchCatalog",
+	"DepotPreflightResult",
+	"DepotSnapshot",
+	"DepotStartOption",
+	"DepotSyncResult",
+	"PlannedDownload",
+	"ProgressCallback",
+	"QuarantineResult",
+	"SyncProgress",
+	"UpdatePlan",
+]

src/ptlinux/game/depot/realms.py

@@ -0,0 +1,82 @@
+"""Launcher labels and runtime requirements for publisher realm options."""
+
+from __future__ import annotations
+
+from pathlib import PurePosixPath
+
+from .models import DepotLaunchCatalog, DepotStartOption
+
+
+PTR_BABEL_REALM_NAME = "PTR Babel"
+PUBLISHER_TEST_BABEL_REALM_NAME = "Test Babel"
+PTR_BABEL_EXECUTABLE_PATH = PurePosixPath("Gamese.exe")
+PTR_BABEL_DLL_PATH = PurePosixPath("gamese.dll")
+
+
+def launcher_realm_name(name: str) -> str:
+	"""Return the launcher-facing name for one publisher realm name."""
+
+	if name.casefold() == PUBLISHER_TEST_BABEL_REALM_NAME.casefold():
+		return PTR_BABEL_REALM_NAME
+	return name
+
+
+def launcher_launch_catalog(catalog: DepotLaunchCatalog) -> DepotLaunchCatalog:
+	"""Apply launcher presentation names without changing launch metadata."""
+
+	options = tuple(_launcher_start_option(option) for option in catalog.start_options)
+	default_name = catalog.default_start_option
+	for publisher_option, launcher_option in zip(
+		catalog.start_options,
+		options,
+		strict=True,
+	):
+		if publisher_option.name.casefold() == default_name.casefold():
+			default_name = launcher_option.name
+			break
+	return DepotLaunchCatalog(
+		build=catalog.build,
+		start_options=options,
+		default_start_option=default_name,
+	)
+
+
+def required_start_option_files(
+	option: DepotStartOption,
+) -> tuple[PurePosixPath, ...]:
+	"""Return files required by launcher-defined realm behavior."""
+
+	executable = PurePosixPath(option.path)
+	if (
+		option.name.casefold() != PTR_BABEL_REALM_NAME.casefold()
+		or executable.as_posix().casefold()
+		!= PTR_BABEL_EXECUTABLE_PATH.as_posix().casefold()
+	):
+		return ()
+	return executable, PTR_BABEL_DLL_PATH
+
+
+def _launcher_start_option(option: DepotStartOption) -> DepotStartOption:
+	name = launcher_realm_name(option.name)
+	if (
+		name == option.name
+		or PurePosixPath(option.path).as_posix().casefold()
+		!= PTR_BABEL_EXECUTABLE_PATH.as_posix().casefold()
+	):
+		return option
+	return DepotStartOption(
+		name=name,
+		path=option.path,
+		arguments=option.arguments,
+	)
+
+
+__all__ = [
+	"PTR_BABEL_DLL_PATH",
+	"PTR_BABEL_EXECUTABLE_PATH",
+	"PTR_BABEL_REALM_NAME",
+	"PUBLISHER_TEST_BABEL_REALM_NAME",
+	"launcher_launch_catalog",
+	"launcher_realm_name",
+	"required_start_option_files",
+]

src/ptlinux/game/depot/transfer.py

@@ -0,0 +1,913 @@
+"""Verified HTTP transfer and adaptive scheduling for the game depot."""
+
+from __future__ import annotations
+
+from collections import deque
+from dataclasses import dataclass
+import hashlib
+from http.client import HTTPException
+import json
+import os
+from pathlib import Path, PurePosixPath
+import re
+import threading
+import time
+from typing import Callable, Iterable, Mapping, Protocol
+from urllib.error import HTTPError
+from urllib.parse import quote, urlparse
+from urllib.request import Request
+
+from .models import DepotError, DepotFile, DepotSnapshot
+
+
+class DownloadLimits:
+	"""Scheduler settings supplied by the stable depot facade."""
+
+	minimum_workers: int
+
+	@property
+	def effective_bandwidth_limit(self) -> int | None:
+		raise NotImplementedError
+
+	@property
+	def effective_maximum_workers(self) -> int:
+		raise NotImplementedError
+
+
+@dataclass(frozen=True)
+class DownloadTelemetry:
+	"""One internal measurement produced while retrieving a depot file."""
+
+	kind: str
+	file: str
+	server: str
+	attempt: int
+	latency_seconds: float | None = None
+	bytes_written: int = 0
+	write_seconds: float = 0.0
+	reason: str | None = None
+	http_status: int | None = None
+	resumed_bytes: int = 0
+
+
+DownloadObserver = Callable[[DownloadTelemetry], None]
+
+
+class BandwidthLimiter:
+	"""Thread-safe aggregate byte-rate limiter with a one-chunk burst allowance."""
+
+	def __init__(
+		self,
+		bytes_per_second: int,
+		*,
+		clock: Callable[[], float] = time.monotonic,
+		sleeper: Callable[[float], None] = time.sleep,
+	) -> None:
+		if isinstance(bytes_per_second, bool) or bytes_per_second <= 0:
+			raise ValueError("bandwidth limit must be positive")
+		self.bytes_per_second = bytes_per_second
+		self._clock = clock
+		self._sleeper = sleeper
+		self._lock = threading.Lock()
+		self._next_available_at = clock()
+
+	def consume(self, byte_count: int) -> None:
+		"""Reserve aggregate transfer time for a newly received chunk."""
+
+		if byte_count < 0:
+			raise ValueError("byte count must not be negative")
+		if byte_count == 0:
+			return
+		with self._lock:
+			now = self._clock()
+			start = max(now, self._next_available_at)
+			self._next_available_at = start + (byte_count / self.bytes_per_second)
+			delay = start - now
+		if delay > 0:
+			self._sleeper(delay)
+
+
+def normalized_cpu_load() -> float | None:
+	"""Return one-minute runnable load normalized by the available CPU count."""
+
+	try:
+		load = os.getloadavg()[0]
+	except (AttributeError, OSError):
+		return None
+	processors = os.cpu_count()
+	if processors is None or processors <= 0:
+		return None
+	return max(0.0, load / processors)
+
+
+def prune_transfer_samples(
+	samples: deque[tuple[float, int]],
+	now: float,
+	*,
+	window_seconds: float,
+) -> None:
+	"""Discard transfer samples older than the configured rate window."""
+
+	cutoff = now - window_seconds
+	while len(samples) > 2 and samples[1][0] <= cutoff:
+		samples.popleft()
+
+
+def sample_rate(samples: deque[tuple[float, int]]) -> float | None:
+	"""Calculate bytes per second between the oldest and newest samples."""
+
+	if len(samples) < 2:
+		return None
+	first_time, first_bytes = samples[0]
+	last_time, last_bytes = samples[-1]
+	elapsed = last_time - first_time
+	if elapsed <= 0 or last_bytes < first_bytes:
+		return None
+	return (last_bytes - first_bytes) / elapsed
+
+
+class AdaptiveConcurrencyController:
+	"""Select a bounded worker target from live network, host, and plan data."""
+
+	def __init__(
+		self,
+		options: DownloadLimits,
+		*,
+		clock: Callable[[], float] = time.monotonic,
+		cpu_load: Callable[[], float | None] | None = None,
+		initial_workers: int = 8,
+		evaluation_interval_seconds: float = 1.0,
+		retry_window_seconds: float = 15.0,
+		retry_recovery_seconds: float = 5.0,
+		transfer_rate_window_seconds: float = 5.0,
+	) -> None:
+		self.options = options
+		self._clock = clock
+		self._cpu_load = cpu_load or normalized_cpu_load
+		self._initial_workers = initial_workers
+		self._evaluation_interval_seconds = evaluation_interval_seconds
+		self._retry_window_seconds = retry_window_seconds
+		self._retry_recovery_seconds = retry_recovery_seconds
+		self._transfer_rate_window_seconds = transfer_rate_window_seconds
+		self._lock = threading.Lock()
+		self._target = max(
+			options.minimum_workers,
+			min(initial_workers, options.effective_maximum_workers),
+		)
+		self._last_evaluation = clock()
+		self._transferred_bytes = 0
+		self._transfer_samples: deque[tuple[float, int]] = deque(
+			[(self._last_evaluation, 0)]
+		)
+		self._response_samples: deque[tuple[float, float]] = deque()
+		self._retry_samples: deque[float] = deque()
+		self._retry_count = 0
+		self._handled_retry_count = 0
+		self._last_retry_at: float | None = None
+		self._latency_seconds: float | None = None
+		self._disk_samples: deque[tuple[float, int, float]] = deque()
+
+	def record_response(self, latency_seconds: float) -> None:
+		if latency_seconds < 0:
+			return
+		now = self._clock()
+		with self._lock:
+			self._response_samples.append((now, latency_seconds))
+			self._prune_health_samples(now)
+			if self._latency_seconds is None:
+				self._latency_seconds = latency_seconds
+			else:
+				self._latency_seconds = (
+					(self._latency_seconds * 0.75) + (latency_seconds * 0.25)
+				)
+
+	def record_retry(self) -> None:
+		now = self._clock()
+		with self._lock:
+			self._retry_count += 1
+			self._retry_samples.append(now)
+			self._last_retry_at = now
+			self._prune_health_samples(now)
+
+	def record_chunk(self, byte_count: int, write_seconds: float) -> None:
+		if byte_count <= 0:
+			return
+		now = self._clock()
+		with self._lock:
+			self._transferred_bytes += byte_count
+			self._transfer_samples.append((now, self._transferred_bytes))
+			prune_transfer_samples(
+				self._transfer_samples,
+				now,
+				window_seconds=self._transfer_rate_window_seconds,
+			)
+			self._disk_samples.append((now, byte_count, max(0.0, write_seconds)))
+			self._prune_disk_samples(now)
+
+	def _prune_health_samples(self, now: float) -> None:
+		cutoff = now - self._retry_window_seconds
+		while self._response_samples and self._response_samples[0][0] < cutoff:
+			self._response_samples.popleft()
+		while self._retry_samples and self._retry_samples[0] < cutoff:
+			self._retry_samples.popleft()
+
+	def _prune_disk_samples(self, now: float) -> None:
+		cutoff = now - self._transfer_rate_window_seconds
+		while self._disk_samples and self._disk_samples[0][0] < cutoff:
+			self._disk_samples.popleft()
+
+	def target_workers(self, remaining_files: int, remaining_bytes: int) -> int:
+		"""Return the next target; active workers are allowed to drain naturally."""
+
+		if remaining_files <= 0:
+			return 0
+		maximum = min(self.options.effective_maximum_workers, remaining_files)
+		minimum = min(self.options.minimum_workers, maximum)
+		with self._lock:
+			self._target = min(maximum, max(minimum, self._target))
+			now = self._clock()
+			average_file_size = remaining_bytes / max(1, remaining_files)
+			if now - self._last_evaluation < self._evaluation_interval_seconds:
+				return self._target
+			self._last_evaluation = now
+			prune_transfer_samples(
+				self._transfer_samples,
+				now,
+				window_seconds=self._transfer_rate_window_seconds,
+			)
+			self._prune_health_samples(now)
+			self._prune_disk_samples(now)
+			rate = sample_rate(self._transfer_samples)
+			attempts = len(self._response_samples) + len(self._retry_samples)
+			error_rate = len(self._retry_samples) / attempts if attempts else 0.0
+			latency = self._latency_seconds
+			disk_bytes = sum(sample[1] for sample in self._disk_samples)
+			disk_seconds = sum(sample[2] for sample in self._disk_samples)
+			disk_rate = disk_bytes / disk_seconds if disk_seconds > 0 else None
+			try:
+				cpu_load = self._cpu_load()
+			except (OSError, ValueError):
+				cpu_load = None
+
+			new_retries = self._retry_count - self._handled_retry_count
+			if new_retries:
+				self._handled_retry_count = self._retry_count
+				if error_rate >= 0.12 and self._target > minimum:
+					backoff = min(2, new_retries)
+					self._target = max(minimum, self._target - backoff)
+				return self._target
+
+			resource_constrained = (
+				(cpu_load is not None and cpu_load >= 0.90)
+				or (
+					rate is not None
+					and disk_rate is not None
+					and disk_rate < rate * 0.75
+				)
+			)
+			if resource_constrained and self._target > minimum:
+				self._target -= 1
+				return self._target
+
+			limit = self.options.effective_bandwidth_limit
+			limit_saturated = (
+				limit is not None and rate is not None and rate >= limit * 0.90
+			)
+			healthy = (
+				(cpu_load is None or cpu_load < 0.80)
+				and (rate is None or disk_rate is None or disk_rate >= rate)
+			)
+			retry_recovery_pending = (
+				self._last_retry_at is not None
+				and now - self._last_retry_at < self._retry_recovery_seconds
+			)
+			if (
+				healthy
+				and not retry_recovery_pending
+				and not limit_saturated
+				and self._target < maximum
+			):
+				step = 2 if (
+					(latency is not None and latency >= 0.75)
+					or average_file_size <= 512 * 1024
+				) else 1
+				self._target = min(maximum, self._target + step)
+			return min(maximum, max(minimum, self._target))
+
+
+class HttpResponse(Protocol):
+	"""The small response surface used by the native depot client."""
+
+	headers: Mapping[str, str]
+
+	def read(self, size: int = -1) -> bytes: ...
+
+	def close(self) -> None: ...
+
+
+HttpOpener = Callable[..., HttpResponse]
+
+
+@dataclass(frozen=True)
+class DepotHttpPolicy:
+	"""Facade-owned policy and parsers consumed by the HTTP implementation."""
+
+	configuration_url: Callable[[], str]
+	server_candidates: Callable[
+		[Mapping[str, object] | None, str],
+		tuple[tuple[str, str], ...],
+	]
+	depot_manifest_url: Callable[[str], str]
+	build_manifest_url: Callable[[str, int], str]
+	file_url: Callable[[str, DepotFile], str]
+	ordered_download_servers: Callable[[str, Iterable[str]], tuple[str, ...]]
+	download_partial_path: Callable[[Path], Path]
+	recover_manifest_file: Callable[[Path, Path, DepotFile], bool]
+	parse_snapshot: Callable[
+		[str, str, Mapping[str, object], Mapping[str, object]],
+		DepotSnapshot,
+	]
+	positive_int: Callable[[object, str], int]
+	content_length: Callable[[str | None], int | None]
+	content_range: Callable[[str | None], tuple[int, int, int]]
+	headers: Callable[[], dict[str, str]]
+	read_size: Callable[[], int]
+	hash_read_size: Callable[[], int]
+	clock: Callable[[], float]
+
+
+class _RetryableDownloadError(DepotError):
+	"""One transient network or content-integrity failure."""
+
+	def __init__(
+		self,
+		message: str,
+		*,
+		discard_partial: bool = False,
+		http_status: int | None = None,
+	) -> None:
+		super().__init__(message)
+		self.discard_partial = discard_partial
+		self.http_status = http_status
+
+
+class DepotHttpClient:
+	"""HTTP implementation for the publisher's documented public depot."""
+
+	def __init__(
+		self,
+		*,
+		policy: DepotHttpPolicy,
+		timeout_seconds: float = 60.0,
+		opener: HttpOpener,
+		retry_delays: tuple[float, ...],
+		sleeper: Callable[[float], None],
+		download_observer: DownloadObserver | None = None,
+	) -> None:
+		if timeout_seconds <= 0:
+			raise ValueError("timeout_seconds must be positive")
+		if any(delay < 0 for delay in retry_delays):
+			raise ValueError("retry delays must not be negative")
+		self.timeout_seconds = timeout_seconds
+		self._policy = policy
+		self._opener = opener
+		self._retry_delays = retry_delays
+		self._sleeper = sleeper
+		self._candidate_servers: tuple[str, ...] = ()
+		self._download_observer = download_observer
+		self._bandwidth_limiter: BandwidthLimiter | None = None
+
+	@property
+	def download_observer(self) -> DownloadObserver | None:
+		return self._download_observer
+
+	@download_observer.setter
+	def download_observer(self, observer: DownloadObserver | None) -> None:
+		self._download_observer = observer
+
+	@property
+	def bandwidth_limiter(self) -> BandwidthLimiter | None:
+		return self._bandwidth_limiter
+
+	@bandwidth_limiter.setter
+	def bandwidth_limiter(self, limiter: BandwidthLimiter | None) -> None:
+		self._bandwidth_limiter = limiter
+
+	def fetch_snapshot(self, *, preferred_region: str = "Europe") -> DepotSnapshot:
+		"""Fetch the live depot and build manifests from trusted regional servers."""
+
+		configuration: Mapping[str, object] | None = None
+		configuration_error: DepotError | None = None
+		try:
+			configuration = self._get_json(self._policy.configuration_url())
+		except DepotError as exc:
+			configuration_error = exc
+
+		candidates = self._policy.server_candidates(configuration, preferred_region)
+		self._candidate_servers = tuple(server for _region, server in candidates)
+		last_error = configuration_error
+		for region, server in candidates:
+			try:
+				depot_manifest = self._get_json(self._policy.depot_manifest_url(server))
+				build = self._policy.positive_int(
+					depot_manifest.get("Build"),
+					"depot Build",
+				)
+				build_manifest = self._get_json(
+					self._policy.build_manifest_url(server, build)
+				)
+				return self._policy.parse_snapshot(
+					region,
+					server,
+					depot_manifest,
+					build_manifest,
+				)
+			except DepotError as exc:
+				last_error = exc
+
+		if last_error is not None:
+			raise DepotError(f"could not load the PristonTale EU depot: {last_error}")
+		raise DepotError("could not load the PristonTale EU depot")
+
+	def download_file(
+		self,
+		server: str,
+		file: DepotFile,
+		destination: Path,
+		*,
+		progress: Callable[[int], None] | None = None,
+	) -> None:
+		"""Download, resume, and verify one file before replacing its destination."""
+
+		servers = self._policy.ordered_download_servers(
+			server,
+			self._candidate_servers,
+		)
+		temporary = self._policy.download_partial_path(destination)
+		last_error: _RetryableDownloadError | None = None
+		attempts = len(self._retry_delays) + 1
+		for attempt_index in range(attempts):
+			attempt_server = servers[attempt_index % len(servers)]
+			try:
+				self._download_file_once(
+					attempt_server,
+					file,
+					destination,
+					attempt=attempt_index + 1,
+					progress=progress,
+				)
+				return
+			except _RetryableDownloadError as exc:
+				last_error = exc
+				self._notify_download(
+					DownloadTelemetry(
+						kind="retry",
+						file=file.path,
+						server=attempt_server,
+						attempt=attempt_index + 1,
+						reason=str(exc),
+						http_status=exc.http_status,
+					)
+				)
+				if exc.discard_partial:
+					temporary.unlink(missing_ok=True)
+				if attempt_index >= len(self._retry_delays):
+					break
+				self._sleeper(self._retry_delays[attempt_index])
+
+		assert last_error is not None
+		resume_hint = (
+			"; partial data was retained for the next update run"
+			if temporary.is_file() and not temporary.is_symlink()
+			else ""
+		)
+		raise DepotError(
+			f"download failed for {file.path} after {attempts} attempts: "
+			f"{last_error}{resume_hint}"
+		) from last_error
+
+	def _download_file_once(
+		self,
+		server: str,
+		file: DepotFile,
+		destination: Path,
+		*,
+		attempt: int,
+		progress: Callable[[int], None] | None,
+	) -> None:
+		temporary = self._policy.download_partial_path(destination)
+		written = 0
+		digest = hashlib.sha1(usedforsecurity=False)
+		if temporary.is_symlink():
+			raise DepotError(f"refusing to use symbolic-link partial file for {file.path}")
+		if temporary.exists():
+			if not temporary.is_file():
+				raise DepotError(f"partial download is not a file for {file.path}")
+			try:
+				with temporary.open("rb") as partial_handle:
+					while True:
+						chunk = partial_handle.read(self._policy.hash_read_size())
+						if not chunk:
+							break
+						written += len(chunk)
+						digest.update(chunk)
+			except OSError as exc:
+				raise DepotError(
+					f"cannot inspect partial download for {file.path}: {exc}"
+				) from exc
+
+			if written > file.size:
+				temporary.unlink()
+				written = 0
+				digest = hashlib.sha1(usedforsecurity=False)
+			elif written == file.size:
+				if digest.hexdigest().casefold() == file.sha1.casefold():
+					self._notify_download(
+						DownloadTelemetry(
+							kind="resume",
+							file=file.path,
+							server=server,
+							attempt=attempt,
+							resumed_bytes=written,
+						)
+					)
+					temporary.replace(destination)
+					if progress is not None:
+						progress(written)
+					return
+				temporary.unlink()
+				written = 0
+				digest = hashlib.sha1(usedforsecurity=False)
+			elif written and self._policy.recover_manifest_file(
+				temporary,
+				destination,
+				file,
+			):
+				self._notify_download(
+					DownloadTelemetry(
+						kind="resume",
+						file=file.path,
+						server=server,
+						attempt=attempt,
+						resumed_bytes=written,
+					)
+				)
+				temporary.unlink(missing_ok=True)
+				if progress is not None:
+					progress(file.size)
+				return
+		if progress is not None:
+			progress(written)
+
+		requested_offset = written
+		if requested_offset:
+			self._notify_download(
+				DownloadTelemetry(
+					kind="resume",
+					file=file.path,
+					server=server,
+					attempt=attempt,
+					resumed_bytes=requested_offset,
+				)
+			)
+		headers = self._policy.headers()
+		if requested_offset:
+			headers["Range"] = f"bytes={requested_offset}-"
+		url = self._policy.file_url(server, file)
+		request = Request(url, headers=headers, method="GET")
+		self._notify_download(
+			DownloadTelemetry(
+				kind="request",
+				file=file.path,
+				server=server,
+				attempt=attempt,
+			)
+		)
+		request_started_at = self._policy.clock()
+		try:
+			response = self._opener(request, timeout=self.timeout_seconds)
+		except HTTPError as exc:
+			status = exc.code
+			exc.close()
+			if status == 416 and requested_offset:
+				raise _RetryableDownloadError(
+					f"server rejected the saved offset for {file.path}",
+					discard_partial=True,
+					http_status=status,
+				) from exc
+			raise _RetryableDownloadError(
+				f"HTTP {status} from {server} for {file.path}",
+				http_status=status,
+			) from exc
+		except (OSError, HTTPException) as exc:
+			raise _RetryableDownloadError(
+				f"could not connect to {server} for {file.path}: {exc}"
+			) from exc
+		response_status = getattr(response, "status", None)
+		self._notify_download(
+			DownloadTelemetry(
+				kind="response",
+				file=file.path,
+				server=server,
+				attempt=attempt,
+				latency_seconds=max(
+					0.0,
+					self._policy.clock() - request_started_at,
+				),
+				http_status=(
+					response_status if isinstance(response_status, int) else None
+				),
+			)
+		)
+
+		try:
+			append = False
+			if requested_offset:
+				range_header = response.headers.get("Content-Range")
+				status = getattr(response, "status", None)
+				if status == 206 or range_header is not None:
+					try:
+						range_start, _range_end, range_total = (
+							self._policy.content_range(range_header)
+						)
+					except DepotError as exc:
+						raise _RetryableDownloadError(
+							f"invalid resume response from {server} for {file.path}: {exc}"
+						) from exc
+					if range_start != requested_offset or range_total != file.size:
+						raise _RetryableDownloadError(
+							f"resume response did not match {file.path}: "
+							f"offset {range_start}/{requested_offset}, "
+							f"size {range_total}/{file.size}"
+						)
+					append = True
+				else:
+					written = 0
+					digest = hashlib.sha1(usedforsecurity=False)
+					if progress is not None:
+						progress(written)
+
+			try:
+				declared_length = self._policy.content_length(
+					response.headers.get("Content-Length")
+				)
+			except DepotError as exc:
+				raise _RetryableDownloadError(
+					f"invalid response length from {server} for {file.path}: {exc}"
+				) from exc
+			remaining = file.size - written
+			if declared_length is not None and declared_length > remaining:
+				raise _RetryableDownloadError(
+					f"download exceeds expected size for {file.path}: "
+					f"server declared {declared_length}, expected at most {remaining}"
+				)
+
+			mode = "ab" if append else "wb"
+			try:
+				with temporary.open(mode) as handle:
+					while True:
+						try:
+							chunk = response.read(self._policy.read_size())
+						except (OSError, HTTPException) as exc:
+							raise _RetryableDownloadError(
+								f"could not read {file.path} from {server}: {exc}"
+							) from exc
+						if not chunk:
+							break
+						written += len(chunk)
+						if written > file.size:
+							raise _RetryableDownloadError(
+								f"download exceeds expected size for {file.path}",
+								discard_partial=True,
+							)
+						if self._bandwidth_limiter is not None:
+							self._bandwidth_limiter.consume(len(chunk))
+						digest.update(chunk)
+						write_started_at = self._policy.clock()
+						handle.write(chunk)
+						self._notify_download(
+							DownloadTelemetry(
+								kind="chunk",
+								file=file.path,
+								server=server,
+								attempt=attempt,
+								bytes_written=len(chunk),
+								write_seconds=max(
+									0.0,
+									self._policy.clock() - write_started_at,
+								),
+							)
+						)
+						if progress is not None:
+							progress(written)
+			except _RetryableDownloadError:
+				raise
+			except OSError as exc:
+				raise DepotError(
+					f"cannot write partial download for {file.path}: {exc}"
+				) from exc
+
+			if written != file.size or digest.hexdigest().casefold() != file.sha1.casefold():
+				if self._policy.recover_manifest_file(temporary, destination, file):
+					temporary.unlink(missing_ok=True)
+					if progress is not None:
+						progress(file.size)
+					return
+				if written != file.size:
+					raise _RetryableDownloadError(
+						f"incomplete response from {server} for {file.path}: "
+						f"{written}/{file.size} bytes"
+					)
+				raise _RetryableDownloadError(
+					f"SHA-1 mismatch for {file.path} from {server}",
+					discard_partial=True,
+				)
+			temporary.replace(destination)
+		finally:
+			try:
+				response.close()
+			except (OSError, HTTPException):
+				pass
+
+	def _notify_download(self, event: DownloadTelemetry) -> None:
+		observer = self._download_observer
+		if observer is not None:
+			# noinspection PyBroadException
+			try:
+				observer(event)
+			except Exception:
+				# Telemetry must never weaken verified download behavior.
+				pass
+
+	def _get_json(self, url: str) -> Mapping[str, object]:
+		request = Request(url, headers=self._policy.headers(), method="GET")
+		try:
+			response = self._opener(request, timeout=self.timeout_seconds)
+		except (OSError, HTTPException) as exc:
+			raise DepotError(f"request failed for {url}: {exc}") from exc
+		payload = b""
+		try:
+			payload = response.read()
+		except (OSError, HTTPException) as exc:
+			raise DepotError(f"could not read {url}: {exc}") from exc
+		finally:
+			try:
+				response.close()
+			except (OSError, HTTPException):
+				pass
+		try:
+			value = json.loads(payload.decode("utf-8-sig"))
+		except (UnicodeDecodeError, json.JSONDecodeError) as exc:
+			raise DepotError(f"invalid JSON from {url}") from exc
+		if not isinstance(value, dict):
+			raise DepotError(f"unexpected JSON root from {url}")
+		return value
+
+
+def server_candidates(
+	configuration: Mapping[str, object] | None,
+	preferred_region: str,
+	*,
+	fallback_servers: Iterable[str],
+) -> tuple[tuple[str, str], ...]:
+	"""Return normalized publisher servers in deterministic preference order."""
+
+	entries: list[tuple[str, str]] = []
+	if configuration is not None:
+		regions = configuration.get("Regions")
+		default_region = configuration.get("DefaultRegion")
+		if isinstance(regions, list):
+			ordered = [preferred_region]
+			if isinstance(default_region, str) and default_region not in ordered:
+				ordered.append(default_region)
+			for region_name in ordered:
+				for region in regions:
+					if not isinstance(region, dict) or region.get("Name") != region_name:
+						continue
+					servers = region.get("Servers")
+					if isinstance(servers, list):
+						for server in servers:
+							if not isinstance(server, str):
+								continue
+							try:
+								entries.append((region_name, normalize_server(server)))
+							except DepotError:
+								continue
+	seen: set[str] = set()
+	unique: list[tuple[str, str]] = []
+	for region, server in [
+		*entries,
+		*(("Fallback", value) for value in fallback_servers),
+	]:
+		if server in seen:
+			continue
+		seen.add(server)
+		unique.append((region, server))
+	return tuple(unique)
+
+
+def normalize_server(value: str) -> str:
+	"""Validate and normalize one trusted CDN host/path value."""
+
+	server = value.strip().strip("/")
+	if not server or "://" in server or any(character.isspace() for character in server):
+		raise DepotError(f"invalid CDN server: {value!r}")
+	parsed = urlparse(f"https://{server}")
+	if not parsed.netloc or parsed.query or parsed.fragment or "@" in parsed.netloc:
+		raise DepotError(f"invalid CDN server: {value!r}")
+	parts = PurePosixPath(parsed.path).parts
+	if any(part in (".", "..") for part in parts):
+		raise DepotError(f"invalid CDN server path: {value!r}")
+	return f"{parsed.netloc}{parsed.path.rstrip('/')}"
+
+
+def depot_manifest_url(server: str, *, depot_id: int) -> str:
+	return f"https://{server}/depots/{depot_id}/manifest.json"
+
+
+def build_manifest_url(server: str, build: int, *, depot_id: int) -> str:
+	return f"https://{server}/depots/{depot_id}/builds/{build}.json"
+
+
+def file_url(server: str, file: DepotFile, *, depot_id: int) -> str:
+	return (
+		f"https://{server}/depots/{depot_id}/builds/{file.build}/"
+		f"{quote(file.path, safe='/')}"
+	)
+
+
+def ordered_download_servers(
+	primary: str,
+	candidates: Iterable[str],
+) -> tuple[str, ...]:
+	ordered: list[str] = []
+	seen: set[str] = set()
+	for value in (primary, *candidates):
+		server = normalize_server(value)
+		if server in seen:
+			continue
+		seen.add(server)
+		ordered.append(server)
+	return tuple(ordered)
+
+
+def download_partial_path(destination: Path) -> Path:
+	return destination.with_name(f".{destination.name}.ptlinux.partial")
+
+
+def content_length(value: str | None) -> int | None:
+	if value is None:
+		return None
+	try:
+		length = int(value)
+	except ValueError as exc:
+		raise DepotError(f"invalid Content-Length: {value!r}") from exc
+	if length < 0:
+		raise DepotError(f"invalid Content-Length: {value!r}")
+	return length
+
+
+def content_range(
+	value: str | None,
+	*,
+	pattern: re.Pattern[str],
+) -> tuple[int, int, int]:
+	if value is None:
+		raise DepotError("206 response omitted Content-Range")
+	match = pattern.fullmatch(value.strip())
+	if match is None:
+		raise DepotError(f"invalid Content-Range: {value!r}")
+	start, end, total = (int(part) for part in match.groups())
+	if start > end or end >= total:
+		raise DepotError(f"invalid Content-Range: {value!r}")
+	return start, end, total
+
+
+def request_headers(version: str) -> dict[str, str]:
+	return {"User-Agent": f"PT-Linux/{version} (+https://pristontale.eu/)"}
+
+
+__all__ = [
+	"AdaptiveConcurrencyController",
+	"BandwidthLimiter",
+	"DepotHttpClient",
+	"DepotHttpPolicy",
+	"DownloadLimits",
+	"DownloadObserver",
+	"DownloadTelemetry",
+	"HttpOpener",
+	"HttpResponse",
+	"build_manifest_url",
+	"content_length",
+	"content_range",
+	"depot_manifest_url",
+	"download_partial_path",
+	"file_url",
+	"normalize_server",
+	"normalized_cpu_load",
+	"ordered_download_servers",
+	"prune_transfer_samples",
+	"request_headers",
+	"sample_rate",
+	"server_candidates",
+]

src/ptlinux/game/ptr_compat.py

@@ -0,0 +1,151 @@
+"""Realm-specific compatibility files for the PTR game client."""
+
+from __future__ import annotations
+
+import hashlib
+from pathlib import Path
+import uuid
+
+from ..resource_paths import native_resource_path
+
+
+PTR_BCRYPT_PROXY_FILENAME = "ptr-bcrypt-proxy.dll"
+PTR_BCRYPT_PROXY_SHA256 = (
+	"cf543a0c8f29231e35123c9d229194ee424b57b073a96da4f4ae6b0ebb5ce16a"
+)
+PTR_BCRYPT_RUNTIME_FILENAME = "bcrypt.dll"
+PTR_BCRYPT_ORIGINAL_RUNTIME_FILENAME = "bcrypt_orig.dll"
+PTR_BCRYPT_RUNTIME_FILENAMES = frozenset(
+	{PTR_BCRYPT_RUNTIME_FILENAME, PTR_BCRYPT_ORIGINAL_RUNTIME_FILENAME}
+)
+_PROTON_BCRYPT_CANDIDATES = (
+	Path("dist/lib/wine/i386-windows/bcrypt.dll"),
+	Path("files/lib/wine/i386-windows/bcrypt.dll"),
+)
+
+
+class PtrCompatibilityError(RuntimeError):
+	"""Raised when the verified PTR compatibility overlay cannot be staged."""
+
+
+def stage_ptr_bcrypt_compatibility(
+	runtime_view: Path,
+	proton_script: str | Path | None,
+) -> tuple[Path, Path]:
+	"""Stage the verified proxy and Proton 7's original 32-bit BCrypt DLL."""
+
+	if proton_script is None:
+		raise PtrCompatibilityError(
+			"PTR Babel requires the Proton 7 compatibility runtime"
+		)
+	try:
+		proton = Path(proton_script).expanduser().resolve(strict=True)
+	except (OSError, RuntimeError) as exc:
+		raise PtrCompatibilityError(
+			f"could not resolve the Proton 7 script for PTR Babel: {exc}"
+		) from exc
+	if not proton.is_file():
+		raise PtrCompatibilityError(
+			f"the Proton 7 script for PTR Babel is not a file: {proton}"
+		)
+
+	proxy_source = native_resource_path(PTR_BCRYPT_PROXY_FILENAME)
+	proxy_bytes = _read_file(proxy_source, "packaged PTR BCrypt proxy")
+	proxy_hash = _sha256_bytes(proxy_bytes)
+	if proxy_hash != PTR_BCRYPT_PROXY_SHA256:
+		raise PtrCompatibilityError(
+			"the packaged PTR BCrypt proxy failed its integrity check"
+		)
+
+	original_source = _find_proton_bcrypt(proton)
+	original_bytes = _read_file(original_source, "Proton 7 32-bit BCrypt DLL")
+	if not _is_i386_pe(original_bytes):
+		raise PtrCompatibilityError(
+			f"the Proton 7 BCrypt module is not a 32-bit PE DLL: {original_source}"
+		)
+
+	original_target = runtime_view / PTR_BCRYPT_ORIGINAL_RUNTIME_FILENAME
+	proxy_target = runtime_view / PTR_BCRYPT_RUNTIME_FILENAME
+	# Install the forwarding target first, so a partial write can never expose a
+	# proxy whose forwarded exports have nowhere to resolve.
+	_write_runtime_file(original_target, original_bytes)
+	_write_runtime_file(proxy_target, proxy_bytes)
+	return proxy_target, original_target
+
+
+def ptr_bcrypt_dll_overrides(current: str | None) -> str:
+	"""Force native BCrypt while preserving unrelated Wine DLL overrides."""
+
+	overrides: list[str] = []
+	for entry in (current or "").split(";"):
+		entry = entry.strip()
+		if not entry:
+			continue
+		name, separator, _value = entry.partition("=")
+		if separator and name.strip().lstrip("*").casefold() == "bcrypt":
+			continue
+		overrides.append(entry)
+	overrides.append("bcrypt=n")
+	return ";".join(overrides)
+
+
+def _find_proton_bcrypt(proton_script: Path) -> Path:
+	for relative in _PROTON_BCRYPT_CANDIDATES:
+		candidate = proton_script.parent / relative
+		if candidate.is_file():
+			return candidate
+	locations = ", ".join(str(path) for path in _PROTON_BCRYPT_CANDIDATES)
+	raise PtrCompatibilityError(
+		"the selected Proton 7 installation has no 32-bit BCrypt module "
+		f"({locations})"
+	)
+
+
+def _read_file(path: Path, description: str) -> bytes:
+	try:
+		return path.read_bytes()
+	except OSError as exc:
+		raise PtrCompatibilityError(f"could not read {description} {path}: {exc}") from exc
+
+
+def _write_runtime_file(destination: Path, content: bytes) -> None:
+	expected_hash = _sha256_bytes(content)
+	if not destination.is_symlink() and destination.is_file():
+		try:
+			if _sha256_bytes(destination.read_bytes()) == expected_hash:
+				return
+		except OSError:
+			pass
+	temporary = destination.with_name(f".{destination.name}.{uuid.uuid4().hex}.tmp")
+	try:
+		temporary.write_bytes(content)
+		temporary.chmod(0o644)
+		temporary.replace(destination)
+		if _sha256_bytes(destination.read_bytes()) != expected_hash:
+			raise OSError("written file did not retain the expected digest")
+	except OSError as exc:
+		raise PtrCompatibilityError(
+			f"could not stage PTR compatibility file {destination}: {exc}"
+		) from exc
+	finally:
+		try:
+			temporary.unlink(missing_ok=True)
+		except OSError:
+			pass
+
+
+def _is_i386_pe(content: bytes) -> bool:
+	if len(content) < 0x40 or content[:2] != b"MZ":
+		return False
+	pe_offset = int.from_bytes(content[0x3C:0x40], "little")
+	if pe_offset < 0x40 or pe_offset + 26 > len(content):
+		return False
+	return (
+		content[pe_offset : pe_offset + 4] == b"PE\0\0"
+		and int.from_bytes(content[pe_offset + 4 : pe_offset + 6], "little") == 0x14C
+		and int.from_bytes(content[pe_offset + 24 : pe_offset + 26], "little") == 0x10B
+	)
+
+
+def _sha256_bytes(content: bytes) -> str:
+	return hashlib.sha256(content).hexdigest()

src/ptlinux/game/runtime.py

@@ -1,8 +1,8 @@
-"""Portable game runtime selection and Proton/UMU preparation."""
+"""Portable game runtime selection, preparation, and launch."""
 
 from __future__ import annotations
 
-from dataclasses import asdict, dataclass
+from dataclasses import asdict, dataclass, replace
 from datetime import datetime
 import hashlib
 import json
@@ -15,22 +15,32 @@ import shutil
 import sys
 from typing import Mapping, Sequence
 
-from .command import CommandOutcome, CommandRunner, OutputLineFilter
+from ..command import CommandOutcome, CommandRunner, OutputLineFilter
-from .container_host import container_host_error, inspect_container_host
+from ..container_host import container_host_error, inspect_container_host
-from .depot import DEFAULT_DEPOT_START_OPTION, DepotStartOption
+from ..depot import DEFAULT_DEPOT_START_OPTION, DepotStartOption
-from .gamebox import (
+from ..gamebox import (
 	GameboxConfigurationError,
 	build_gamebox_command,
 	find_gamescope,
 	read_game_canvas_size,
 )
-from .paths import AppPaths
+from ..paths import AppPaths
-from .settings import Settings
+from ..settings import Settings
-from .system_identity import (
+from ..system_identity import (
 	detect_distribution_id as _detect_distribution_id,
 	is_running_inside_steam_runtime as _is_running_inside_steam_runtime,
 )
-from .umu import find_umu_launcher
+from ..umu import find_umu_launcher
+from .depot.realms import (
+	PTR_BABEL_REALM_NAME,
+	launcher_realm_name,
+	required_start_option_files,
+)
+from .ptr_compat import (
+	PtrCompatibilityError,
+	ptr_bcrypt_dll_overrides,
+	stage_ptr_bcrypt_compatibility,
+)
 
 
 WINDOWS_GAME_DIRECTORY = r"C:\Program Files (x86)\Pristontale EU"
@@ -68,6 +78,26 @@ class RuntimeSelection:
 	steam_root: str | None
 
 
+def runtime_settings_for_realm(
+	settings: Settings,
+	realm: str | None = None,
+) -> Settings:
+	"""Apply compatibility requirements for the selected game realm."""
+
+	selected_realm = launcher_realm_name(realm or settings.realm)
+	if selected_realm.casefold() == PTR_BABEL_REALM_NAME.casefold():
+		# PTR V21.78.89 is stable on the retained Proton 7 runtime once its CNG
+		# SHA-256 pseudo-handle call is supplied by the scoped BCrypt proxy.
+		return replace(
+			settings,
+			realm=PTR_BABEL_REALM_NAME,
+			runtime="proton7",
+		)
+	if selected_realm != settings.realm:
+		return replace(settings, realm=selected_realm)
+	return settings
+
+
 def select_runtime(
 	settings: Settings,
 	environment: Mapping[str, str] | None = None,
@@ -76,6 +106,7 @@ def select_runtime(
 	distribution_id: str | None = None,
 	kernel_release: str | None = None,
 ) -> RuntimeSelection:
+	settings = runtime_settings_for_realm(settings)
 	env = os.environ if environment is None else environment
 	umu = find_umu_launcher(paths, env)
 	current_umu_host = prefers_current_umu_host(
@@ -419,10 +450,21 @@ def run_game(
 	_require_container_host(selection, runner)
 	if not paths.runtime_view.is_dir() and not runner.dry_run:
 		raise RuntimeErrorPT("runtime view is missing; prepare the game first")
+	ptr_babel = bool(required_start_option_files(start_option))
 	native_executable, windows_executable, game_arguments = _game_start_command(
 		paths,
 		start_option,
 	)
+	if not runner.dry_run:
+		_validate_start_option_runtime_files(paths.runtime_view, start_option)
+		if ptr_babel:
+			try:
+				stage_ptr_bcrypt_compatibility(
+					paths.runtime_view,
+					selection.proton_path,
+				)
+			except PtrCompatibilityError as exc:
+				raise RuntimeErrorPT(str(exc)) from exc
 	if selection.kind == "umu":
 		game_command = [
 			selection.executable,
@@ -469,6 +511,14 @@ def run_game(
 		)
 	if extra_environment:
 		environment.update(extra_environment)
+	if ptr_babel:
+		existing_overrides = environment.get(
+			"WINEDLLOVERRIDES",
+			os.environ.get("WINEDLLOVERRIDES"),
+		)
+		environment["WINEDLLOVERRIDES"] = ptr_bcrypt_dll_overrides(
+			existing_overrides
+		)
 	if use_gamebox:
 		gamescope_path = None
 		game_size = None
@@ -577,6 +627,19 @@ def _resolve_runtime_path_case(root: Path, relative: PurePosixPath) -> Path:
 	return cursor
 
 
+def _validate_start_option_runtime_files(
+	runtime_view: Path,
+	option: DepotStartOption,
+) -> None:
+	for relative in required_start_option_files(option):
+		path = _resolve_runtime_path_case(runtime_view, relative)
+		if not path.is_file():
+			raise RuntimeErrorPT(
+				f"realm {option.name} is unavailable; runtime view is missing "
+				f"{relative.as_posix()}"
+			)
+
+
 def run_runtime_prefix_command(
 	paths: AppPaths,
 	selection: RuntimeSelection,
@@ -635,7 +698,7 @@ def _require_container_host(
 
 def _runtime_python_path(existing: str | None) -> str:
 	"""Make the installed package importable after changing into runtime_view."""
-	package_root = str(Path(__file__).resolve().parent.parent)
+	package_root = str(Path(__file__).resolve().parents[2])
 	if not existing:
 		return package_root
 	return os.pathsep.join((package_root, existing))

src/ptlinux/game/runtime_view.py

@@ -1,4 +1,4 @@
-"""Updater-safe runtime view with one verified normalized scene cache."""
+"""Updater-safe linked game runtime view and compatibility cache."""
 
 from __future__ import annotations
 
@@ -12,13 +12,14 @@ import shutil
 from typing import Mapping
 import uuid
 
-from ptdiag.assbin import (
+from .compatibility.assbin import (
 	SceneInspection,
 	inspect_wrapped_assbin,
 	normalize_wrapped_assbin_textures,
 )
+from .ptr_compat import PTR_BCRYPT_RUNTIME_FILENAMES
 
-from .paths import AppPaths
+from ..paths import AppPaths
 
 
 WHISPERING_VALE_RELATIVE = Path("game/maps/WhisperingVale.rovug")
@@ -869,8 +870,13 @@ def _runtime_layout_ready(
 	runtime = paths.runtime_view
 	if runtime.is_symlink() or not runtime.is_dir():
 		return False
-	top_level_exceptions = {"game", "game.ini", "save"}
+	ptr_compatibility_files = {
-	top_level_special = {"game", "game.ini", "save"}
+		name
+		for name in PTR_BCRYPT_RUNTIME_FILENAMES
+		if not (runtime / name).is_symlink() and (runtime / name).is_file()
+	}
+	top_level_exceptions = {"game", "game.ini", "save", *ptr_compatibility_files}
+	top_level_special = {"game", "game.ini", "save", *ptr_compatibility_files}
 	for name, binary_source in (
 		("Game.exe", game_exe_source),
 		("game.dll", game_dll_source),
@@ -913,6 +919,9 @@ def _runtime_layout_ready(
 		actual_links += 1
 	if game_dll_source != source / "game.dll":
 		actual_links += 1
+	actual_links += sum(
+		1 for name in ptr_compatibility_files if (source / name).exists()
+	)
 	return actual_links == expected_links
 
 

src/ptlinux/gamebox_runtime.py

@@ -0,0 +1,13 @@
+"""Compatibility entry point for managed game-window supervision."""
+
+from __future__ import annotations
+
+import sys
+
+from .presentation import game_window as _implementation
+
+
+if __name__ == "__main__":
+	raise SystemExit(_implementation.main())
+
+sys.modules[__name__] = _implementation

src/ptlinux/gamescope_child_runtime.py

@@ -0,0 +1,13 @@
+"""Compatibility entry point for nested Gamescope process status."""
+
+from __future__ import annotations
+
+import sys
+
+from .presentation import gamescope_child as _implementation
+
+
+if __name__ == "__main__":
+	raise SystemExit(_implementation.main())
+
+sys.modules[__name__] = _implementation

src/ptlinux/gamescope_runtime.py

@@ -0,0 +1,13 @@
+"""Compatibility entry point for Gamescope host supervision."""
+
+from __future__ import annotations
+
+import sys
+
+from .presentation import gamescope as _implementation
+
+
+if __name__ == "__main__":
+	raise SystemExit(_implementation.main())
+
+sys.modules[__name__] = _implementation

src/ptlinux/identity_probe.py

@@ -10,6 +10,7 @@ import re
 
 from .command import CommandRunner
 from .paths import AppPaths
+from .resource_paths import native_resource_path
 from .runtime import RuntimeSelection, run_runtime_prefix_command
 
 
@@ -54,7 +55,7 @@ class IdentityProbeResult:
 
 
 def packaged_identity_probe() -> Path:
-	return Path(__file__).resolve().parent / "native" / "pt-identity-probe.exe"
+	return native_resource_path("pt-identity-probe.exe")
 
 
 def probe_client_identity(

src/ptlinux/launcher_updates/__init__.py

@@ -0,0 +1,140 @@
+"""Launcher update models and feature services."""
+
+from .activation import (
+	ActivationJournal,
+	ActivationPaths,
+	activate_release,
+	journal_release,
+	journal_version,
+	read_activation_journal,
+	recover_interrupted_activation,
+	recovery_telemetry_metadata,
+	release_from_link,
+	replace_release_link,
+	restore_release_links,
+	set_release_link,
+	write_activation_journal,
+)
+from .archive import (
+	archive_matches,
+	download_archive,
+	extract_release_archive,
+	sha256_file,
+)
+from .discovery import (
+	ChannelDiscoveryPolicy,
+	configured_history_url,
+	configured_manifest_url,
+	configured_manifest_urls,
+	configured_public_key_path,
+	fetch_authenticated_manifest,
+	fetch_historical_manifest,
+	fetch_launcher_release_history,
+	fetch_small_file,
+	verify_manifest_signature,
+)
+from .models import (
+	LauncherInstalledRelease,
+	LauncherRemoteHistory,
+	LauncherRemoteRelease,
+	LauncherRollbackResult,
+	LauncherUpdateCheck,
+	LauncherUpdateError,
+	LauncherUpdateHistory,
+	LauncherUpdateResult,
+	LauncherUpdateVerification,
+	ManifestFile,
+	UpdateManifest,
+)
+from .parsing import (
+	UpdateParsingPolicy,
+	parse_launcher_release_history,
+	parse_update_manifest,
+)
+from .rollback import (
+	RollbackOperations,
+	RollbackPaths,
+	SUPPORTED_ROLLBACK_REASONS,
+	inspect_launcher_update_history,
+	launcher_rollback_candidates,
+	rollback_launcher_update,
+)
+from .staging import (
+	StagingPaths,
+	precheck_release_install,
+	read_release_metadata,
+	remove_generated_bytecode_caches,
+	require_free_space,
+	self_check_release,
+	stage_and_install_release,
+	tree_digest,
+	validate_release_directory,
+	verify_file_inventory,
+	verify_manifest_files,
+	verify_retained_release_integrity,
+	write_release_integrity_record,
+)
+
+
+__all__ = [
+	"ActivationJournal",
+	"ActivationPaths",
+	"ChannelDiscoveryPolicy",
+	"LauncherInstalledRelease",
+	"LauncherRemoteHistory",
+	"LauncherRemoteRelease",
+	"LauncherRollbackResult",
+	"LauncherUpdateCheck",
+	"LauncherUpdateError",
+	"LauncherUpdateHistory",
+	"LauncherUpdateResult",
+	"LauncherUpdateVerification",
+	"ManifestFile",
+	"RollbackOperations",
+	"RollbackPaths",
+	"SUPPORTED_ROLLBACK_REASONS",
+	"StagingPaths",
+	"UpdateManifest",
+	"UpdateParsingPolicy",
+	"archive_matches",
+	"activate_release",
+	"configured_history_url",
+	"configured_manifest_url",
+	"configured_manifest_urls",
+	"configured_public_key_path",
+	"download_archive",
+	"fetch_authenticated_manifest",
+	"fetch_historical_manifest",
+	"fetch_launcher_release_history",
+	"fetch_small_file",
+	"extract_release_archive",
+	"inspect_launcher_update_history",
+	"journal_release",
+	"journal_version",
+	"launcher_rollback_candidates",
+	"parse_launcher_release_history",
+	"parse_update_manifest",
+	"precheck_release_install",
+	"read_activation_journal",
+	"read_release_metadata",
+	"recover_interrupted_activation",
+	"recovery_telemetry_metadata",
+	"release_from_link",
+	"remove_generated_bytecode_caches",
+	"replace_release_link",
+	"require_free_space",
+	"restore_release_links",
+	"rollback_launcher_update",
+	"self_check_release",
+	"set_release_link",
+	"sha256_file",
+	"stage_and_install_release",
+	"tree_digest",
+	"validate_release_directory",
+	"verify_file_inventory",
+	"verify_manifest_files",
+	"verify_manifest_signature",
+	"verify_retained_release_integrity",
+	"write_activation_journal",
+	"write_release_integrity_record",
+]

src/ptlinux/launcher_updates/activation.py

@@ -0,0 +1,461 @@
+"""Crash-safe journal and symlink operations for launcher activation."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+import json
+import os
+from pathlib import Path
+from typing import Callable, Mapping, Protocol
+
+from ..update_resolver import ReleaseModelError, STABLE_CHANNEL, SemanticVersion
+from .models import LauncherUpdateError
+
+
+class ActivationPaths(Protocol):
+	@property
+	def app_home(self) -> Path: ...
+
+	@property
+	def launcher_current(self) -> Path: ...
+
+	@property
+	def launcher_previous(self) -> Path: ...
+
+	@property
+	def launcher_releases(self) -> Path: ...
+
+	@property
+	def launcher_update_transaction(self) -> Path: ...
+
+
+@dataclass(frozen=True)
+class ActivationJournal:
+	state: str
+	current: object
+	previous: object
+	target: object
+
+
+def read_activation_journal(
+	paths: ActivationPaths,
+	*,
+	unique_json_object: Callable[[list[tuple[str, object]]], dict[str, object]],
+) -> ActivationJournal | None:
+	"""Read and validate the fixed fields of an activation transaction."""
+
+	journal = paths.launcher_update_transaction
+	try:
+		if journal.is_symlink():
+			raise LauncherUpdateError(
+				f"launcher transaction journal cannot be a link: {journal}"
+			)
+		value = json.loads(
+			journal.read_text(encoding="utf-8"),
+			object_pairs_hook=unique_json_object,
+		)
+	except FileNotFoundError:
+		return None
+	except (OSError, UnicodeError, json.JSONDecodeError, ValueError) as exc:
+		raise LauncherUpdateError(
+			f"launcher transaction journal is invalid: {exc}"
+		) from exc
+	if not isinstance(value, dict) or value.get("schema") != 1:
+		raise LauncherUpdateError(
+			"launcher transaction journal has an unsupported schema"
+		)
+	state = value.get("state")
+	if state not in {"applying", "activated"}:
+		raise LauncherUpdateError("launcher transaction journal has an invalid state")
+	assert isinstance(state, str)
+	return ActivationJournal(
+		state=state,
+		current=value.get("current"),
+		previous=value.get("previous"),
+		target=value.get("target"),
+	)
+
+
+def journal_version(value: object, label: str) -> str:
+	if not isinstance(value, str):
+		raise LauncherUpdateError(
+			f"launcher transaction {label} release is invalid"
+		)
+	try:
+		SemanticVersion.parse(value)
+	except ReleaseModelError as exc:
+		raise LauncherUpdateError(
+			f"launcher transaction {label} version is invalid"
+		) from exc
+	return value
+
+
+def journal_release(
+	paths: ActivationPaths,
+	value: object,
+	label: str,
+	*,
+	validate_release: Callable[[Path], str],
+) -> Path | None:
+	if value is None:
+		return None
+	version = journal_version(value, label)
+	release = paths.launcher_releases / version
+	validate_release(release)
+	return release.resolve()
+
+
+def restore_release_links(
+	paths: ActivationPaths,
+	*,
+	current: Path | None,
+	previous: Path | None,
+	set_link: Callable[[Path, Path | None, Path], None],
+	fsync_directory: Callable[[Path], None],
+) -> None:
+	set_link(paths.launcher_current, current, paths.launcher_releases)
+	set_link(paths.launcher_previous, previous, paths.launcher_releases)
+	fsync_directory(paths.app_home)
+
+
+def set_release_link(
+	link: Path,
+	release: Path | None,
+	releases: Path,
+	*,
+	replace_link: Callable[[Path, Path, Path], None],
+) -> None:
+	if release is not None:
+		replace_link(link, release, releases)
+		return
+	if link.is_symlink():
+		link.unlink()
+	elif link.exists():
+		raise LauncherUpdateError(f"launcher release link is not symbolic: {link}")
+
+
+def write_activation_journal(
+	paths: ActivationPaths,
+	*,
+	state: str,
+	current: Path | None,
+	previous: Path | None,
+	target: Path,
+	updated_at: str,
+	process_id: int,
+	fsync_directory: Callable[[Path], None],
+) -> None:
+	journal = paths.launcher_update_transaction
+	payload = {
+		"schema": 1,
+		"state": state,
+		"current": current.name if current is not None else None,
+		"previous": previous.name if previous is not None else None,
+		"target": target.name,
+		"updated_at": updated_at,
+	}
+	journal.parent.mkdir(parents=True, exist_ok=True)
+	temporary = journal.with_name(f".{journal.name}.{process_id}.tmp")
+	try:
+		with temporary.open("w", encoding="utf-8", newline="\n") as handle:
+			json.dump(payload, handle, indent=2, sort_keys=True)
+			handle.write("\n")
+			handle.flush()
+			os.fsync(handle.fileno())
+		temporary.chmod(0o600)
+		os.replace(temporary, journal)
+		fsync_directory(journal.parent)
+	except BaseException:
+		temporary.unlink(missing_ok=True)
+		raise
+
+
+def replace_release_link(
+	link: Path,
+	release: Path,
+	releases: Path,
+	*,
+	validate_release: Callable[[Path], str],
+	process_id: int,
+) -> None:
+	resolved_release = release.resolve()
+	resolved_releases = releases.resolve()
+	if resolved_release.parent != resolved_releases:
+		raise LauncherUpdateError(
+			f"release is outside the launcher release directory: {release}"
+		)
+	validate_release(resolved_release)
+	temporary = link.with_name(f".{link.name}.{process_id}.tmp")
+	temporary.unlink(missing_ok=True)
+	try:
+		temporary.symlink_to(Path("releases") / resolved_release.name)
+		os.replace(temporary, link)
+	except BaseException:
+		temporary.unlink(missing_ok=True)
+		raise
+
+
+def release_from_link(link: Path, releases: Path) -> Path | None:
+	if not link.is_symlink():
+		if link.exists():
+			raise LauncherUpdateError(
+				f"launcher release link is not symbolic: {link}"
+			)
+		return None
+	try:
+		target_text = os.readlink(link)
+	except OSError as exc:
+		raise LauncherUpdateError(
+			f"cannot read launcher release link {link}: {exc}"
+		) from exc
+	target = (link.parent / target_text).resolve()
+	root = releases.resolve()
+	if target.parent != root:
+		raise LauncherUpdateError(
+			f"launcher release link escapes its release directory: {link}"
+		)
+	if not target.is_dir() or target.is_symlink():
+		raise LauncherUpdateError(f"launcher release link is broken: {link}")
+	return target
+
+
+def activate_release(
+	paths: ActivationPaths,
+	release: Path,
+	*,
+	telemetry_metadata: Mapping[str, object] | None,
+	restore_reason: str,
+	recover: Callable[..., None],
+	resolve_link: Callable[[Path, Path], Path | None],
+	validate: Callable[[Path], str],
+	write_journal: Callable[..., None],
+	replace_link: Callable[[Path, Path, Path], None],
+	sync_directory: Callable[[Path], None],
+	restore_snapshot: Callable[..., None],
+	emit_event: Callable[..., None],
+) -> Path | None:
+	"""Atomically activate a validated release and restore its prior snapshot."""
+
+	if paths.app_home.is_symlink():
+		raise LauncherUpdateError(
+			f"launcher application home cannot be a link: {paths.app_home}"
+		)
+	paths.app_home.mkdir(parents=True, exist_ok=True, mode=0o755)
+	paths.app_home.chmod(0o755)
+	recover(paths)
+	current = resolve_link(paths.launcher_current, paths.launcher_releases)
+	previous = resolve_link(paths.launcher_previous, paths.launcher_releases)
+	if paths.launcher_current.exists() and not paths.launcher_current.is_symlink():
+		raise LauncherUpdateError(
+			f"launcher current path is not a symbolic link: {paths.launcher_current}"
+		)
+	if paths.launcher_previous.exists() and not paths.launcher_previous.is_symlink():
+		raise LauncherUpdateError(
+			f"launcher previous path is not a symbolic link: {paths.launcher_previous}"
+		)
+	resolved_release = release.resolve()
+	validate(resolved_release)
+	if current == resolved_release:
+		return current
+	write_journal(
+		paths,
+		state="applying",
+		current=current,
+		previous=previous,
+		target=resolved_release,
+	)
+	try:
+		if current is not None:
+			validate(current)
+			replace_link(
+				paths.launcher_previous,
+				current,
+				paths.launcher_releases,
+			)
+		replace_link(
+			paths.launcher_current,
+			resolved_release,
+			paths.launcher_releases,
+		)
+		sync_directory(paths.app_home)
+		activated = resolve_link(paths.launcher_current, paths.launcher_releases)
+		retained_previous = resolve_link(
+			paths.launcher_previous,
+			paths.launcher_releases,
+		)
+		expected_previous = current if current is not None else previous
+		if (
+			activated is None
+			or activated != resolved_release
+			or retained_previous != expected_previous
+		):
+			raise LauncherUpdateError(
+				"launcher release links failed their post-activation health check"
+			)
+		assert activated is not None
+		validate(activated)
+		write_journal(
+			paths,
+			state="activated",
+			current=current,
+			previous=previous,
+			target=resolved_release,
+		)
+	except BaseException as activation_error:
+		restore_metadata = {
+			**dict(telemetry_metadata or {}),
+			"reason": restore_reason,
+		}
+		emit_event(
+			"rollback_restore_started",
+			metadata=restore_metadata,
+			operation="launcher_rollback",
+			stage="restore",
+		)
+		try:
+			restore_snapshot(paths, current=current, previous=previous)
+		except BaseException as restore_error:
+			emit_event(
+				"rollback_restore_failed",
+				metadata=restore_metadata,
+				operation="launcher_rollback",
+				stage="restore",
+				severity="critical",
+				message=str(restore_error),
+			)
+			raise LauncherUpdateError(
+				f"launcher activation failed ({activation_error}); "
+				f"snapshot restoration also failed ({restore_error})"
+			) from activation_error
+		paths.launcher_update_transaction.unlink(missing_ok=True)
+		sync_directory(paths.launcher_update_transaction.parent)
+		emit_event(
+			"rollback_restore_success",
+			metadata=restore_metadata,
+			operation="launcher_rollback",
+			stage="restore",
+			severity="warning",
+		)
+		raise
+	paths.launcher_update_transaction.unlink(missing_ok=True)
+	sync_directory(paths.launcher_update_transaction.parent)
+	return current
+
+
+def recover_interrupted_activation(
+	paths: ActivationPaths,
+	*,
+	read_journal: Callable[..., ActivationJournal | None],
+	resolve_journal_release: Callable[..., Path | None],
+	validate_version: Callable[[object, str], str],
+	validate: Callable[[Path], str],
+	resolve_link: Callable[[Path, Path], Path | None],
+	build_recovery_metadata: Callable[[Path | None, str], dict[str, object]],
+	emit_event: Callable[..., None],
+	restore_snapshot: Callable[..., None],
+	sync_directory: Callable[[Path], None],
+) -> None:
+	"""Complete or restore an interrupted activation transaction."""
+
+	journal = paths.launcher_update_transaction
+	transaction = read_journal(paths)
+	if transaction is None:
+		return
+	current = resolve_journal_release(paths, transaction.current, "current")
+	previous = resolve_journal_release(paths, transaction.previous, "previous")
+	target_version = validate_version(transaction.target, "target")
+	target_path = paths.launcher_releases / target_version
+	try:
+		validate(target_path)
+	except LauncherUpdateError:
+		target = None
+	else:
+		target = target_path.resolve()
+	if transaction.state == "activated":
+		active = resolve_link(paths.launcher_current, paths.launcher_releases)
+		retained_previous = resolve_link(
+			paths.launcher_previous,
+			paths.launcher_releases,
+		)
+		expected_previous = current if current is not None else previous
+		if (
+			target is not None
+			and active == target
+			and retained_previous == expected_previous
+		):
+			journal.unlink()
+			sync_directory(journal.parent)
+			return
+	metadata = build_recovery_metadata(current, target_version)
+	emit_event(
+		"rollback_restore_started",
+		metadata=metadata,
+		operation="launcher_rollback",
+		stage="restore",
+		severity="warning",
+	)
+	try:
+		restore_snapshot(paths, current=current, previous=previous)
+	except BaseException as exc:
+		emit_event(
+			"rollback_restore_failed",
+			metadata=metadata,
+			operation="launcher_rollback",
+			stage="restore",
+			severity="critical",
+			message=str(exc),
+		)
+		raise
+	journal.unlink()
+	sync_directory(journal.parent)
+	emit_event(
+		"rollback_restore_success",
+		metadata=metadata,
+		operation="launcher_rollback",
+		stage="restore",
+		severity="warning",
+	)
+
+
+def recovery_telemetry_metadata(
+	current: Path | None,
+	target_version: str,
+	*,
+	running_version: str,
+	release_metadata: Callable[..., dict[str, object]],
+) -> dict[str, object]:
+	current_version = current.name if current is not None else running_version
+	try:
+		current_channel = SemanticVersion.parse(current_version).channel
+	except ReleaseModelError:
+		current_channel = STABLE_CHANNEL
+	target_semantic = SemanticVersion.parse(target_version)
+	return release_metadata(
+		current_version=current_version,
+		target_version=target_version,
+		current_channel=current_channel,
+		target_channel=target_semantic.channel,
+		selected_channel=target_semantic.channel,
+		tag=target_semantic.tag,
+		manifest_schema=None,
+		manifest_sha256=None,
+		rollback=True,
+		reason="failed_update",
+	)
+
+
+__all__ = [
+	"ActivationJournal",
+	"ActivationPaths",
+	"activate_release",
+	"journal_release",
+	"journal_version",
+	"read_activation_journal",
+	"recover_interrupted_activation",
+	"recovery_telemetry_metadata",
+	"release_from_link",
+	"replace_release_link",
+	"restore_release_links",
+	"set_release_link",
+	"write_activation_journal",
+]

src/ptlinux/launcher_updates/archive.py

@@ -0,0 +1,302 @@
+"""Bounded launcher archive download and safe extraction."""
+
+from __future__ import annotations
+
+import hashlib
+import os
+from pathlib import Path, PurePosixPath
+import tarfile
+from typing import AbstractSet, Callable, Mapping, Protocol
+from urllib.error import HTTPError, URLError
+from urllib.request import Request
+
+from .models import LauncherUpdateError, UpdateManifest
+from .parsing import require_https_url
+
+
+class ArchiveResponse(Protocol):
+	headers: Mapping[str, str]
+
+	def __enter__(self) -> ArchiveResponse: ...
+
+	def __exit__(self, *args: object) -> object: ...
+
+	def geturl(self) -> str: ...
+
+	def read(self, size: int = -1) -> bytes: ...
+
+
+ArchiveOpener = Callable[..., ArchiveResponse]
+
+
+def download_archive(
+	manifest: UpdateManifest,
+	destination: Path,
+	*,
+	timeout_seconds: float,
+	user_agent: str,
+	read_size: int,
+	maximum_archive_bytes: int,
+	opener: ArchiveOpener,
+	content_length: Callable[[str | None, str], int | None],
+	fsync_directory: Callable[[Path], None],
+	progress: Callable[[int], None] | None = None,
+	process_id: Callable[[], int] = os.getpid,
+) -> int:
+	"""Download one signed archive atomically and return its received byte count."""
+
+	destination.parent.mkdir(parents=True, exist_ok=True)
+	temporary = destination.with_name(f".{destination.name}.{process_id()}.part")
+	temporary.unlink(missing_ok=True)
+	request = Request(
+		manifest.archive_url,
+		headers={
+			"User-Agent": user_agent,
+			"Accept": "application/gzip, application/octet-stream",
+			"Accept-Encoding": "identity",
+		},
+		method="GET",
+	)
+	written = 0
+	try:
+		try:
+			response = opener(request, timeout=timeout_seconds)
+		except HTTPError as exc:
+			status = exc.code
+			exc.close()
+			raise LauncherUpdateError(
+				f"launcher archive request failed: HTTP {status}"
+			) from exc
+		except (URLError, OSError) as exc:
+			raise LauncherUpdateError(
+				f"launcher archive request failed: {exc}"
+			) from exc
+		with response:
+			require_https_url(response.geturl(), "final update archive URL")
+			length = content_length(
+				response.headers.get("Content-Length"),
+				"launcher archive",
+			)
+			if length is not None and length != manifest.archive_size:
+				raise LauncherUpdateError(
+					"launcher archive Content-Length does not match the signed manifest"
+				)
+			digest = hashlib.sha256()
+			with temporary.open("xb") as handle:
+				while True:
+					chunk = response.read(read_size)
+					if not chunk:
+						break
+					written += len(chunk)
+					if progress is not None:
+						progress(written)
+					if (
+						written > manifest.archive_size
+						or written > maximum_archive_bytes
+					):
+						raise LauncherUpdateError(
+							"launcher archive exceeded its signed size"
+						)
+					digest.update(chunk)
+					handle.write(chunk)
+				handle.flush()
+				os.fsync(handle.fileno())
+		if written != manifest.archive_size:
+			raise LauncherUpdateError(
+				f"launcher archive was incomplete: {written}/{manifest.archive_size} bytes"
+			)
+		if digest.hexdigest() != manifest.archive_sha256:
+			raise LauncherUpdateError(
+				"launcher archive SHA-256 does not match the manifest"
+			)
+		temporary.replace(destination)
+		fsync_directory(destination.parent)
+	except BaseException:
+		temporary.unlink(missing_ok=True)
+		raise
+	return written
+
+
+def extract_release_archive(
+	archive: Path,
+	destination: Path,
+	version: str,
+	*,
+	archive_prefix: str,
+	allowed_release_roots: AbstractSet[str],
+	maximum_archive_members: int,
+	maximum_extracted_bytes: int,
+	read_size: int,
+) -> None:
+	"""Extract a flat or bridge-wrapped archive after validating every member."""
+
+	expected_root = f"{archive_prefix}{version}"
+	archive_layout: str | None = None
+	seen: set[PurePosixPath] = set()
+	total_bytes = 0
+	try:
+		bundle = tarfile.open(archive, "r:gz")
+	except (OSError, tarfile.TarError) as exc:
+		raise LauncherUpdateError(f"launcher archive cannot be opened: {exc}") from exc
+	with bundle:
+		members = bundle.getmembers()
+		if not members or len(members) > maximum_archive_members:
+			raise LauncherUpdateError("launcher archive has an invalid member count")
+		for member in members:
+			name = (
+				member.name[:-1]
+				if member.isdir() and member.name.endswith("/")
+				else member.name
+			)
+			if not name or "\\" in name or "\x00" in name:
+				raise LauncherUpdateError(
+					f"unsafe launcher archive path: {member.name!r}"
+				)
+			raw_parts = name.split("/")
+			if any(part in {"", ".", ".."} for part in raw_parts):
+				raise LauncherUpdateError(
+					f"unsafe launcher archive path: {member.name!r}"
+				)
+			path = PurePosixPath(name)
+			if path.is_absolute() or not path.parts:
+				raise LauncherUpdateError(
+					f"unsafe launcher archive path: {member.name!r}"
+				)
+			if path.parts[0] == expected_root:
+				member_layout = "wrapped"
+			elif path.parts[0] in allowed_release_roots:
+				member_layout = "flat"
+			else:
+				raise LauncherUpdateError(
+					f"unexpected launcher archive path: {member.name!r}"
+				)
+			if archive_layout is None:
+				archive_layout = member_layout
+			elif archive_layout != member_layout:
+				raise LauncherUpdateError(
+					"launcher archive mixes flat and legacy wrapped paths"
+				)
+			relative = (
+				path.relative_to(expected_root)
+				if archive_layout == "wrapped"
+				else path
+			)
+			if not relative.parts:
+				if not member.isdir():
+					raise LauncherUpdateError(
+						"launcher archive root must be a directory"
+					)
+				continue
+			if relative.parts[0] not in allowed_release_roots:
+				raise LauncherUpdateError(
+					f"unexpected launcher payload path: {relative.as_posix()}"
+				)
+			if relative in seen:
+				raise LauncherUpdateError(
+					f"duplicate launcher archive path: {relative.as_posix()}"
+				)
+			seen.add(relative)
+			if not member.isdir() and not member.isfile():
+				raise LauncherUpdateError(
+					f"unsupported launcher archive member: {member.name!r}"
+				)
+			if (
+				relative.parts[0] == "release.json"
+				and (len(relative.parts) != 1 or not member.isfile())
+			):
+				raise LauncherUpdateError(
+					f"unexpected launcher metadata path: {member.name!r}"
+				)
+			if (
+				len(relative.parts) == 1
+				and relative.parts[0] in {"ptlinux", "ptdiag"}
+				and not member.isdir()
+			):
+				raise LauncherUpdateError(
+					f"launcher package root must be a directory: {member.name!r}"
+				)
+			if member.mode & 0o022:
+				raise LauncherUpdateError(
+					"launcher archive member is group/world writable: "
+					f"{member.name!r}"
+				)
+			permissions = member.mode & 0o777
+			if member.isfile() and permissions not in {0o644, 0o755}:
+				raise LauncherUpdateError(
+					"launcher archive member has unsupported permissions: "
+					f"{member.name!r}"
+				)
+			target = destination.joinpath(*relative.parts)
+			if member.isdir():
+				target.mkdir(parents=True, exist_ok=True, mode=0o755)
+				continue
+			if member.size < 0:
+				raise LauncherUpdateError(
+					"launcher archive contains a negative file size"
+				)
+			total_bytes += member.size
+			if total_bytes > maximum_extracted_bytes:
+				raise LauncherUpdateError(
+					"launcher archive exceeds its extraction limit"
+				)
+			target.parent.mkdir(parents=True, exist_ok=True, mode=0o755)
+			source = bundle.extractfile(member)
+			if source is None:
+				raise LauncherUpdateError(
+					f"cannot read launcher payload: {member.name!r}"
+				)
+			written = 0
+			with source, target.open("xb") as handle:
+				while True:
+					chunk = source.read(read_size)
+					if not chunk:
+						break
+					written += len(chunk)
+					if written > member.size:
+						raise LauncherUpdateError(
+							"launcher payload exceeded its declared size: "
+							f"{member.name!r}"
+						)
+					handle.write(chunk)
+			if written != member.size:
+				raise LauncherUpdateError(
+					f"launcher payload was incomplete: {member.name!r}"
+				)
+			target.chmod(permissions)
+
+
+def archive_matches(
+	path: Path,
+	manifest: UpdateManifest,
+	*,
+	read_size: int,
+	hash_file: Callable[[Path], str] | None = None,
+) -> bool:
+	try:
+		if path.stat().st_size != manifest.archive_size:
+			return False
+		digest = (
+			hash_file(path)
+			if hash_file is not None
+			else sha256_file(path, read_size=read_size)
+		)
+		return digest == manifest.archive_sha256
+	except OSError:
+		return False
+
+
+def sha256_file(path: Path, *, read_size: int) -> str:
+	digest = hashlib.sha256()
+	with path.open("rb") as handle:
+		for chunk in iter(lambda: handle.read(read_size), b""):
+			digest.update(chunk)
+	return digest.hexdigest()
+
+
+__all__ = [
+	"ArchiveOpener",
+	"archive_matches",
+	"download_archive",
+	"extract_release_archive",
+	"sha256_file",
+]

src/ptlinux/launcher_updates/discovery.py

@@ -0,0 +1,377 @@
+"""Channel discovery and authenticated launcher metadata retrieval."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, replace
+import os
+from pathlib import Path
+import shutil
+import subprocess
+import tempfile
+from typing import Callable, Mapping, Protocol
+from urllib.error import HTTPError, URLError
+from urllib.request import Request
+
+from ..update_resolver import ReleaseModelError, validate_channel
+from .models import (
+	LauncherRemoteHistory,
+	LauncherRemoteRelease,
+	LauncherUpdateError,
+	UpdateManifest,
+)
+from .parsing import require_https_url, resource_url, signature_url
+
+
+@dataclass(frozen=True)
+class ChannelDiscoveryPolicy:
+	"""Channel names, defaults, and environment keys owned by the facade."""
+
+	stable_channel: str
+	prerelease_channel: str
+	default_stable_manifest_url: str
+	default_prerelease_manifest_url: str
+	default_history_url: str
+	manifest_url_variable: str
+	stable_manifest_url_variable: str
+	prerelease_manifest_url_variable: str
+	history_url_variable: str
+	public_key_variable: str
+
+
+class SmallResponse(Protocol):
+	headers: Mapping[str, str]
+
+	def __enter__(self) -> SmallResponse: ...
+
+	def __exit__(self, *args: object) -> object: ...
+
+	def geturl(self) -> str: ...
+
+	def read(self, size: int = -1) -> bytes: ...
+
+
+SmallFileOpener = Callable[..., SmallResponse]
+SmallFileFetcher = Callable[..., bytes]
+SignatureVerifier = Callable[[bytes, bytes, Path], None]
+ManifestParser = Callable[[bytes], UpdateManifest]
+HistoryParser = Callable[..., LauncherRemoteHistory]
+
+
+def configured_manifest_url(
+	environment: Mapping[str, str] | None,
+	*,
+	channel: str,
+	policy: ChannelDiscoveryPolicy,
+) -> str:
+	"""Return the direct channel URL retained for legacy callers."""
+
+	urls = configured_manifest_urls(
+		channel=channel,
+		environment=environment,
+		policy=policy,
+	)
+	return urls[-1][1]
+
+
+def configured_manifest_urls(
+	*,
+	channel: str,
+	environment: Mapping[str, str] | None,
+	policy: ChannelDiscoveryPolicy,
+) -> tuple[tuple[str, str, bool], ...]:
+	"""Return channel, URL, and optionality for authenticated discovery."""
+
+	try:
+		validate_channel(channel)
+	except ReleaseModelError as exc:
+		raise LauncherUpdateError(str(exc)) from exc
+	env = os.environ if environment is None else environment
+	generic_override = env.get(policy.manifest_url_variable)
+	if generic_override:
+		return ((channel, generic_override, False),)
+	stable_url = env.get(
+		policy.stable_manifest_url_variable,
+		policy.default_stable_manifest_url,
+	)
+	if channel == policy.stable_channel:
+		return ((policy.stable_channel, stable_url, False),)
+	prerelease_url = env.get(
+		policy.prerelease_manifest_url_variable,
+		policy.default_prerelease_manifest_url,
+	)
+	return (
+		(policy.stable_channel, stable_url, False),
+		(policy.prerelease_channel, prerelease_url, True),
+	)
+
+
+def configured_public_key_path(
+	environment: Mapping[str, str] | None,
+	*,
+	variable: str,
+	default_path: Path,
+) -> Path:
+	env = os.environ if environment is None else environment
+	configured = env.get(variable)
+	return Path(configured).expanduser() if configured else default_path
+
+
+def configured_history_url(
+	environment: Mapping[str, str] | None,
+	*,
+	policy: ChannelDiscoveryPolicy,
+) -> str:
+	env = os.environ if environment is None else environment
+	return env.get(policy.history_url_variable, policy.default_history_url)
+
+
+def fetch_launcher_release_history(
+	*,
+	history_url: str,
+	public_key_path: Path,
+	timeout_seconds: float,
+	history_bytes_limit: int,
+	signature_bytes_limit: int,
+	small_file_fetcher: SmallFileFetcher,
+	verify_signature: SignatureVerifier,
+	parse_history: HistoryParser,
+) -> LauncherRemoteHistory:
+	"""Fetch and authenticate the immutable-release catalog used for rollback."""
+
+	require_https_url(history_url, "release history URL")
+	history_bytes = small_file_fetcher(
+		history_url,
+		maximum_bytes=history_bytes_limit,
+		timeout_seconds=timeout_seconds,
+		label="release history",
+	)
+	signature_bytes = small_file_fetcher(
+		signature_url(history_url),
+		maximum_bytes=signature_bytes_limit,
+		timeout_seconds=timeout_seconds,
+		label="release history signature",
+	)
+	verify_signature(history_bytes, signature_bytes, public_key_path)
+	return parse_history(history_bytes, history_url=history_url)
+
+
+def fetch_authenticated_manifest(
+	url: str,
+	public_key_path: Path,
+	*,
+	timeout_seconds: float,
+	manifest_bytes_limit: int,
+	signature_bytes_limit: int,
+	small_file_fetcher: SmallFileFetcher,
+	verify_signature: SignatureVerifier,
+	parse_manifest: ManifestParser,
+) -> UpdateManifest:
+	manifest_bytes = small_file_fetcher(
+		url,
+		maximum_bytes=manifest_bytes_limit,
+		timeout_seconds=timeout_seconds,
+		label="update manifest",
+	)
+	signature_bytes = small_file_fetcher(
+		signature_url(url),
+		maximum_bytes=signature_bytes_limit,
+		timeout_seconds=timeout_seconds,
+		label="update manifest signature",
+	)
+	verify_signature(manifest_bytes, signature_bytes, public_key_path)
+	return parse_manifest(manifest_bytes)
+
+
+def fetch_historical_manifest(
+	release: LauncherRemoteRelease,
+	public_key_path: Path,
+	*,
+	timeout_seconds: float,
+	manifest_bytes_limit: int,
+	signature_bytes_limit: int,
+	small_file_fetcher: SmallFileFetcher,
+	verify_signature: SignatureVerifier,
+	parse_manifest: ManifestParser,
+) -> UpdateManifest:
+	manifest_bytes = small_file_fetcher(
+		release.manifest_url,
+		maximum_bytes=manifest_bytes_limit,
+		timeout_seconds=timeout_seconds,
+		label=f"launcher {release.version} manifest",
+	)
+	signature_bytes = small_file_fetcher(
+		release.manifest_signature_url,
+		maximum_bytes=signature_bytes_limit,
+		timeout_seconds=timeout_seconds,
+		label=f"launcher {release.version} manifest signature",
+	)
+	verify_signature(manifest_bytes, signature_bytes, public_key_path)
+	manifest = parse_manifest(manifest_bytes)
+	for field, actual, expected in (
+		("version", manifest.version, release.version),
+		("channel", manifest.channel, release.channel),
+		("tag", manifest.tag, release.tag),
+	):
+		if actual != expected:
+			raise LauncherUpdateError(
+				f"historical manifest {field} {actual!r} does not match "
+				f"signed history {expected!r}"
+			)
+	if release.config_schema is not None or release.minimum_config_schema is not None:
+		if release.config_schema is None or release.minimum_config_schema is None:
+			raise LauncherUpdateError(
+				"signed history has incomplete config compatibility metadata"
+			)
+		manifest = replace(
+			manifest,
+			config_schema=release.config_schema,
+			minimum_config_schema=release.minimum_config_schema,
+		)
+	return manifest
+
+
+def fetch_small_file(
+	url: str,
+	*,
+	maximum_bytes: int,
+	timeout_seconds: float,
+	label: str,
+	user_agent: str,
+	opener: SmallFileOpener,
+) -> bytes:
+	"""Retrieve one bounded file without accepting cross-resource redirects."""
+
+	request = Request(
+		url,
+		headers={
+			"User-Agent": user_agent,
+			"Accept": "application/octet-stream, application/json",
+			"Accept-Encoding": "identity",
+			"Cache-Control": "no-cache",
+			"Pragma": "no-cache",
+		},
+		method="GET",
+	)
+	try:
+		response = opener(request, timeout=timeout_seconds)
+	except HTTPError as exc:
+		status = exc.code
+		exc.close()
+		raise LauncherUpdateError(f"{label} request failed: HTTP {status}") from exc
+	except (URLError, OSError) as exc:
+		raise LauncherUpdateError(f"{label} request failed: {exc}") from exc
+	with response:
+		final_url = response.geturl()
+		require_https_url(final_url, f"final {label} URL")
+		if resource_url(final_url) != resource_url(url):
+			raise LauncherUpdateError(
+				f"{label} redirected unexpectedly to {final_url}; "
+				"the launcher update channel must be publicly readable"
+			)
+		length = content_length(response.headers.get("Content-Length"), label)
+		if length is not None and length > maximum_bytes:
+			raise LauncherUpdateError(f"{label} exceeds its size limit")
+		data = response.read(maximum_bytes + 1)
+	if len(data) > maximum_bytes:
+		raise LauncherUpdateError(f"{label} exceeds its size limit")
+	if length is not None and len(data) != length:
+		raise LauncherUpdateError(f"{label} response was incomplete")
+	if not data:
+		raise LauncherUpdateError(f"{label} response was empty")
+	return data
+
+
+def verify_manifest_signature(
+	manifest: bytes,
+	signature: bytes,
+	public_key_path: Path,
+	*,
+	maximum_signature_bytes: int,
+) -> None:
+	"""Verify an update document with the pinned launcher public key."""
+
+	if not signature or len(signature) > maximum_signature_bytes:
+		raise LauncherUpdateError("update manifest signature has an invalid size")
+	key = public_key_path.expanduser().resolve()
+	if not key.is_file():
+		raise LauncherUpdateError(f"launcher update public key is missing: {key}")
+	openssl = shutil.which("openssl")
+	if not openssl:
+		raise LauncherUpdateError("OpenSSL is required to verify launcher updates")
+	with tempfile.TemporaryDirectory(prefix="ptlinux-update-signature-") as temporary:
+		root = Path(temporary)
+		manifest_path = root / "manifest.json"
+		signature_path = root / "manifest.json.sig"
+		manifest_path.write_bytes(manifest)
+		signature_path.write_bytes(signature)
+		commands = (
+			[
+				openssl,
+				"dgst",
+				"-sha256",
+				"-verify",
+				str(key),
+				"-signature",
+				str(signature_path),
+				str(manifest_path),
+			],
+			[
+				openssl,
+				"pkeyutl",
+				"-verify",
+				"-rawin",
+				"-pubin",
+				"-inkey",
+				str(key),
+				"-sigfile",
+				str(signature_path),
+				"-in",
+				str(manifest_path),
+			],
+		)
+		for command in commands:
+			try:
+				result = subprocess.run(
+					command,
+					capture_output=True,
+					text=True,
+					encoding="utf-8",
+					errors="replace",
+					timeout=10,
+					check=False,
+				)
+			except (OSError, subprocess.TimeoutExpired):
+				continue
+			if result.returncode == 0:
+				return
+	raise LauncherUpdateError("launcher update manifest signature is invalid")
+
+
+def content_length(value: str | None, label: str) -> int | None:
+	if value is None:
+		return None
+	try:
+		length = int(value)
+	except ValueError as exc:
+		raise LauncherUpdateError(
+			f"{label} returned an invalid Content-Length"
+		) from exc
+	if length < 0:
+		raise LauncherUpdateError(f"{label} returned an invalid Content-Length")
+	return length
+
+
+__all__ = [
+	"ChannelDiscoveryPolicy",
+	"SmallFileOpener",
+	"configured_history_url",
+	"configured_manifest_url",
+	"configured_manifest_urls",
+	"configured_public_key_path",
+	"content_length",
+	"fetch_authenticated_manifest",
+	"fetch_historical_manifest",
+	"fetch_launcher_release_history",
+	"fetch_small_file",
+	"verify_manifest_signature",
+]

src/ptlinux/launcher_updates/models.py

@@ -0,0 +1,181 @@
+"""Immutable models shared by launcher update services."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from ..update_resolver import ACTIVE_STATUS, STABLE_CHANNEL, ReleaseRecord
+
+
+class LauncherUpdateError(RuntimeError):
+	"""Raised when a launcher update cannot be trusted or installed safely."""
+
+
+@dataclass(frozen=True)
+class ManifestFile:
+	path: str
+	size: int
+	sha256: str
+
+
+@dataclass(frozen=True)
+class UpdateManifest:
+	schema: int
+	channel: str
+	version: str
+	minimum_updater_version: str
+	archive_url: str
+	archive_sha256: str
+	archive_size: int
+	published_at: str
+	notes_url: str | None
+	tag: str | None = None
+	commit: str | None = None
+	status: str = ACTIVE_STATUS
+	title: str | None = None
+	summary: str | None = None
+	notes_markdown: str | None = None
+	archive_name: str | None = None
+	files: tuple[ManifestFile, ...] = ()
+	manifest_sha256: str | None = None
+	config_schema: int = 1
+	minimum_config_schema: int = 1
+
+
+@dataclass(frozen=True)
+class LauncherUpdateCheck:
+	current_version: str
+	latest_version: str
+	available: bool
+	supported: bool
+	reason: str
+	manifest_url: str
+	manifest: UpdateManifest
+	checked_at: str | None = None
+	selected_channel: str = STABLE_CHANNEL
+
+
+@dataclass(frozen=True)
+class LauncherUpdateResult:
+	changed: bool
+	current_version: str
+	installed_version: str
+	release_directory: str | None
+	previous_release: str | None
+	archive: str | None
+	archive_sha256: str | None
+	restart_required: bool
+	state_recorded: bool
+	warning: str | None
+	selected_channel: str = STABLE_CHANNEL
+	installed_channel: str = STABLE_CHANNEL
+	tag: str | None = None
+	manifest_schema: int | None = None
+	manifest_sha256: str | None = None
+
+
+@dataclass(frozen=True)
+class LauncherUpdateVerification:
+	current_version: str
+	release_version: str
+	manifest_url: str
+	archive_url: str
+	archive_size: int
+	archive_sha256: str
+	payload_files: int
+	channel: str = STABLE_CHANNEL
+	tag: str | None = None
+	manifest_sha256: str | None = None
+
+
+@dataclass(frozen=True)
+class LauncherRollbackResult:
+	from_version: str
+	to_version: str
+	current_release: str
+	previous_release: str
+	restart_required: bool
+	from_channel: str = STABLE_CHANNEL
+	to_channel: str = STABLE_CHANNEL
+	state_recorded: bool = True
+	warning: str | None = None
+
+
+@dataclass(frozen=True)
+class LauncherInstalledRelease:
+	"""One validated release retained in the launcher's version store."""
+
+	version: str
+	installed_at: str
+	directory: str
+	active: bool
+	previous: bool
+	channel: str = STABLE_CHANNEL
+
+
+@dataclass(frozen=True)
+class LauncherUpdateHistory:
+	"""Validated launcher releases available for inspection or rollback."""
+
+	current_version: str | None
+	previous_version: str | None
+	releases: tuple[LauncherInstalledRelease, ...]
+
+
+@dataclass(frozen=True)
+class LauncherRemoteRelease:
+	"""One independently installable release from signed remote history."""
+
+	version: str
+	channel: str
+	tag: str
+	manifest_url: str
+	manifest_signature_url: str
+	release_date: str
+	release_notes_url: str
+	status: str
+	title: str
+	release_id: int | None = None
+	config_schema: int | None = None
+	minimum_config_schema: int | None = None
+
+	def resolver_record(self) -> ReleaseRecord:
+		return ReleaseRecord(
+			version=self.version,
+			channel=self.channel,
+			status=self.status,
+			tag=self.tag,
+			manifest_url=self.manifest_url,
+			manifest_signature_url=self.manifest_signature_url,
+			release_date=self.release_date,
+			release_notes_url=self.release_notes_url,
+			compatibility={
+				"config_schema": self.config_schema,
+				"minimum_config_schema": self.minimum_config_schema,
+			},
+		)
+
+
+@dataclass(frozen=True)
+class LauncherRemoteHistory:
+	"""Authenticated release catalog used for history and remote rollback."""
+
+	generated_at: str
+	history_url: str
+	releases: tuple[LauncherRemoteRelease, ...]
+	history_sha256: str
+
+
+__all__ = [
+	"LauncherInstalledRelease",
+	"LauncherRemoteHistory",
+	"LauncherRemoteRelease",
+	"LauncherRollbackResult",
+	"LauncherUpdateCheck",
+	"LauncherUpdateError",
+	"LauncherUpdateHistory",
+	"LauncherUpdateResult",
+	"LauncherUpdateVerification",
+	"ManifestFile",
+	"UpdateManifest",
+]

src/ptlinux/launcher_updates/parsing.py

@@ -0,0 +1,527 @@
+"""Strict parsers for authenticated launcher manifests and release history."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import datetime
+import hashlib
+import json
+from pathlib import PurePosixPath
+import re
+from typing import AbstractSet
+from urllib.parse import urlsplit, urlunsplit
+
+from ..update_resolver import (
+	ReleaseModelError,
+	SemanticVersion,
+	validate_channel_version,
+)
+from .models import (
+	LauncherInstalledRelease,
+	LauncherRemoteHistory,
+	LauncherRemoteRelease,
+	LauncherUpdateError,
+	ManifestFile,
+	UpdateManifest,
+)
+
+
+@dataclass(frozen=True)
+class UpdateParsingPolicy:
+	"""Size, schema, and release-shape limits supplied by the public facade."""
+
+	application: str
+	manifest_bytes: int
+	history_bytes: int
+	embedded_release_notes_bytes: int
+	archive_bytes: int
+	extracted_bytes: int
+	archive_members: int
+	release_history_schema: int
+	release_history_entries: int
+	sha256_pattern: re.Pattern[str]
+	allowed_release_roots: AbstractSet[str]
+	active_status: str
+	supported_release_statuses: AbstractSet[str]
+
+
+def parse_launcher_release_history(
+	data: bytes,
+	*,
+	history_url: str,
+	policy: UpdateParsingPolicy,
+) -> LauncherRemoteHistory:
+	"""Strictly parse an already authenticated remote release catalog."""
+
+	if not data or len(data) > policy.history_bytes:
+		raise LauncherUpdateError("release history has an invalid size")
+	require_https_url(history_url, "release history URL")
+	try:
+		value = json.loads(
+			data.decode("utf-8"),
+			object_pairs_hook=unique_json_object,
+		)
+	except (UnicodeDecodeError, json.JSONDecodeError, ValueError) as exc:
+		raise LauncherUpdateError(f"release history is invalid JSON: {exc}") from exc
+	if not isinstance(value, dict):
+		raise LauncherUpdateError("release history must contain a JSON object")
+	if value.get("application") != policy.application:
+		raise LauncherUpdateError(
+			f"release history application must be {policy.application!r}"
+		)
+	if required_integer(value, "schema") != policy.release_history_schema:
+		raise LauncherUpdateError("unsupported release history schema")
+	generated_at = required_string(value, "generated_at")
+	parse_published_at(generated_at)
+	releases_value = value.get("releases")
+	if (
+		not isinstance(releases_value, list)
+		or len(releases_value) > policy.release_history_entries
+	):
+		raise LauncherUpdateError("release history releases must be a bounded array")
+	releases: list[LauncherRemoteRelease] = []
+	seen: set[SemanticVersion] = set()
+	last_version: SemanticVersion | None = None
+	for item in releases_value:
+		if not isinstance(item, dict):
+			raise LauncherUpdateError("release history entry must be an object")
+		version = required_string(item, "version")
+		channel = required_string(item, "channel")
+		tag = required_string(item, "tag")
+		try:
+			parsed = validate_channel_version(channel, version)
+		except ReleaseModelError as exc:
+			raise LauncherUpdateError(f"invalid release history entry: {exc}") from exc
+		if tag != parsed.tag:
+			raise LauncherUpdateError(
+				f"release history tag {tag!r} does not match version {version}"
+			)
+		if parsed in seen:
+			raise LauncherUpdateError(f"duplicate release history version: {version}")
+		if last_version is not None and parsed >= last_version:
+			raise LauncherUpdateError(
+				"release history entries must be sorted by descending semantic version"
+			)
+		seen.add(parsed)
+		last_version = parsed
+		status = required_string(item, "status")
+		if status not in policy.supported_release_statuses:
+			raise LauncherUpdateError(f"unsupported release status: {status!r}")
+		manifest_url = required_string(item, "manifest_url")
+		manifest_signature_url = required_string(item, "manifest_signature_url")
+		release_date = required_string(item, "release_date")
+		release_notes_url = required_string(item, "release_notes_url")
+		for url, label in (
+			(manifest_url, "historical manifest URL"),
+			(manifest_signature_url, "historical manifest signature URL"),
+			(release_notes_url, "historical release notes URL"),
+		):
+			require_https_url(url, label)
+		if resource_url(manifest_signature_url) != resource_url(
+			signature_url(manifest_url)
+		):
+			raise LauncherUpdateError(
+				f"release history signature URL does not match manifest {version}"
+			)
+		parse_published_at(release_date)
+		title = required_string(item, "title")
+		release_id_value = item.get("release_id")
+		if release_id_value is not None and (
+			isinstance(release_id_value, bool)
+			or not isinstance(release_id_value, int)
+			or release_id_value <= 0
+		):
+			raise LauncherUpdateError(
+				"release history release_id must be positive or null"
+			)
+		config_schema, minimum_config_schema = parse_history_compatibility(
+			item.get("compatibility")
+		)
+		releases.append(
+			LauncherRemoteRelease(
+				version=version,
+				channel=channel,
+				tag=tag,
+				manifest_url=manifest_url,
+				manifest_signature_url=manifest_signature_url,
+				release_date=release_date,
+				release_notes_url=release_notes_url,
+				status=status,
+				title=title,
+				release_id=release_id_value,
+				config_schema=config_schema,
+				minimum_config_schema=minimum_config_schema,
+			)
+		)
+	return LauncherRemoteHistory(
+		generated_at=generated_at,
+		history_url=history_url,
+		releases=tuple(releases),
+		history_sha256=hashlib.sha256(data).hexdigest(),
+	)
+
+
+def parse_history_compatibility(value: object) -> tuple[int | None, int | None]:
+	if value is None:
+		return None, None
+	if not isinstance(value, dict):
+		raise LauncherUpdateError("release history compatibility must be an object")
+	config_schema = optional_positive_integer(value, "config_schema")
+	minimum_config_schema = optional_positive_integer(
+		value,
+		"minimum_config_schema",
+	)
+	if (config_schema is None) != (minimum_config_schema is None):
+		raise LauncherUpdateError(
+			"release history compatibility must include both config schema bounds"
+		)
+	if (
+		config_schema is not None
+		and minimum_config_schema is not None
+		and minimum_config_schema > config_schema
+	):
+		raise LauncherUpdateError(
+			"release history minimum_config_schema exceeds config_schema"
+		)
+	return config_schema, minimum_config_schema
+
+
+def parse_update_manifest(
+	data: bytes,
+	*,
+	policy: UpdateParsingPolicy,
+) -> UpdateManifest:
+	"""Strictly parse one already-authenticated manifest."""
+
+	if not data or len(data) > policy.manifest_bytes:
+		raise LauncherUpdateError("update manifest has an invalid size")
+	try:
+		value = json.loads(
+			data.decode("utf-8"),
+			object_pairs_hook=unique_json_object,
+		)
+	except (UnicodeDecodeError, json.JSONDecodeError, ValueError) as exc:
+		raise LauncherUpdateError(f"update manifest is invalid JSON: {exc}") from exc
+	if not isinstance(value, dict):
+		raise LauncherUpdateError("update manifest must contain a JSON object")
+	application = value.get("application")
+	if application is not None and application != policy.application:
+		raise LauncherUpdateError(
+			f"update manifest application must be {policy.application!r}"
+		)
+	schema = required_integer(value, "schema")
+	if schema != 1:
+		raise LauncherUpdateError(f"unsupported update manifest schema: {schema}")
+	channel = required_string(value, "channel")
+	version = required_string(value, "version")
+	minimum = required_string(value, "minimum_updater_version")
+	try:
+		parsed_version = validate_channel_version(channel, version)
+	except ReleaseModelError as exc:
+		raise LauncherUpdateError(f"invalid update manifest release: {exc}") from exc
+	parse_version(minimum, "minimum updater version")
+	archive_url = required_string(value, "archive_url")
+	require_https_url(archive_url, "update archive URL")
+	archive_sha256 = required_string(value, "archive_sha256")
+	if policy.sha256_pattern.fullmatch(archive_sha256) is None:
+		raise LauncherUpdateError("archive_sha256 must be a lowercase SHA-256 digest")
+	archive_size = required_integer(value, "archive_size")
+	if archive_size <= 0 or archive_size > policy.archive_bytes:
+		raise LauncherUpdateError(
+			f"update archive size must be between 1 and {policy.archive_bytes} bytes"
+		)
+	published_at = required_string(value, "published_at")
+	parse_published_at(published_at)
+	notes_value = value.get("notes_url")
+	if notes_value is not None and not isinstance(notes_value, str):
+		raise LauncherUpdateError("notes_url must be a string or null")
+	if notes_value:
+		require_https_url(notes_value, "release notes URL")
+	tag_value = value.get("tag", parsed_version.tag)
+	if not isinstance(tag_value, str) or tag_value != parsed_version.tag:
+		raise LauncherUpdateError("manifest tag does not match its version")
+	commit_value = value.get("commit")
+	if commit_value is not None and (
+		not isinstance(commit_value, str)
+		or re.fullmatch(r"[0-9a-f]{7,64}", commit_value) is None
+	):
+		raise LauncherUpdateError("manifest commit must be a lowercase Git object ID")
+	status_value = value.get("status", policy.active_status)
+	if (
+		not isinstance(status_value, str)
+		or status_value not in policy.supported_release_statuses
+	):
+		raise LauncherUpdateError(f"unsupported release status: {status_value!r}")
+	title_value: str | None = None
+	summary_value: str | None = None
+	notes_markdown_value: str | None = None
+	release_value = value.get("release")
+	if release_value is not None:
+		if not isinstance(release_value, dict):
+			raise LauncherUpdateError("manifest release field must be an object")
+		title_value = required_string(release_value, "title")
+		summary_value = required_string(release_value, "summary")
+		notes_markdown_candidate = release_value.get("notes_markdown")
+		if notes_markdown_candidate is not None:
+			if (
+				not isinstance(notes_markdown_candidate, str)
+				or not notes_markdown_candidate
+				or "\x00" in notes_markdown_candidate
+				or len(notes_markdown_candidate.encode("utf-8"))
+				> policy.embedded_release_notes_bytes
+			):
+				raise LauncherUpdateError(
+					"manifest release.notes_markdown is invalid or too large"
+				)
+			notes_markdown_value = notes_markdown_candidate
+		release_notes_value = required_string(release_value, "release_notes_url")
+		require_https_url(release_notes_value, "release notes URL")
+		if notes_value and notes_value != release_notes_value:
+			raise LauncherUpdateError("manifest release notes URLs do not match")
+		notes_value = release_notes_value
+	archive_name = PurePosixPath(urlsplit(archive_url).path).name
+	archive_value = value.get("archive")
+	if archive_value is not None:
+		if not isinstance(archive_value, dict):
+			raise LauncherUpdateError("manifest archive field must be an object")
+		archive_name = required_string(archive_value, "name")
+		if PurePosixPath(archive_name).name != archive_name:
+			raise LauncherUpdateError("manifest archive name must be a filename")
+		if PurePosixPath(urlsplit(archive_url).path).name != archive_name:
+			raise LauncherUpdateError("manifest archive name does not match its URL")
+		if (
+			required_string(archive_value, "url") != archive_url
+			or required_string(archive_value, "sha256") != archive_sha256
+			or required_integer(archive_value, "size") != archive_size
+		):
+			raise LauncherUpdateError(
+				"manifest archive fields do not match legacy metadata"
+			)
+	config_schema = 1
+	minimum_config_schema = 1
+	compatibility_value = value.get("compatibility")
+	if compatibility_value is not None:
+		if not isinstance(compatibility_value, dict):
+			raise LauncherUpdateError("manifest compatibility field must be an object")
+		config_schema = required_positive_integer(
+			compatibility_value,
+			"config_schema",
+		)
+		minimum_config_schema = required_positive_integer(
+			compatibility_value,
+			"minimum_config_schema",
+		)
+		if minimum_config_schema > config_schema:
+			raise LauncherUpdateError(
+				"manifest minimum_config_schema exceeds config_schema"
+			)
+		compatibility_manifest_schema = compatibility_value.get("manifest_schema")
+		if (
+			compatibility_manifest_schema is not None
+			and compatibility_manifest_schema != schema
+		):
+			raise LauncherUpdateError(
+				"manifest compatibility schema does not match its schema"
+			)
+		compatibility_minimum = compatibility_value.get("minimum_updater_version")
+		if compatibility_minimum is not None and compatibility_minimum != minimum:
+			raise LauncherUpdateError(
+				"manifest compatibility minimum updater version does not match"
+			)
+	files = parse_manifest_files(value.get("files"), policy=policy)
+	return UpdateManifest(
+		schema=schema,
+		channel=channel,
+		version=version,
+		minimum_updater_version=minimum,
+		archive_url=archive_url,
+		archive_sha256=archive_sha256,
+		archive_size=archive_size,
+		published_at=published_at,
+		notes_url=notes_value or None,
+		tag=tag_value,
+		commit=commit_value,
+		status=status_value,
+		title=title_value,
+		summary=summary_value,
+		notes_markdown=notes_markdown_value,
+		archive_name=archive_name,
+		files=files,
+		manifest_sha256=hashlib.sha256(data).hexdigest(),
+		config_schema=config_schema,
+		minimum_config_schema=minimum_config_schema,
+	)
+
+
+def parse_manifest_files(
+	value: object,
+	*,
+	policy: UpdateParsingPolicy,
+) -> tuple[ManifestFile, ...]:
+	if value is None:
+		return ()
+	if not isinstance(value, list) or len(value) > policy.archive_members:
+		raise LauncherUpdateError("manifest files must be a bounded array")
+	files: list[ManifestFile] = []
+	last_path = ""
+	for item in value:
+		if not isinstance(item, dict):
+			raise LauncherUpdateError("manifest file entry must be an object")
+		path_value = required_string(item, "path")
+		raw_parts = path_value.split("/")
+		path = PurePosixPath(path_value)
+		if (
+			"\\" in path_value
+			or "\x00" in path_value
+			or any(part in {"", ".", ".."} for part in raw_parts)
+			or path.is_absolute()
+			or not path.parts
+			or path.parts[0] not in policy.allowed_release_roots
+		):
+			raise LauncherUpdateError(f"unsafe manifest file path: {path_value!r}")
+		if path_value <= last_path:
+			raise LauncherUpdateError(
+				"manifest files must be uniquely sorted by path"
+			)
+		size = required_integer(item, "size")
+		if size < 0 or size > policy.extracted_bytes:
+			raise LauncherUpdateError(f"invalid manifest file size: {path_value}")
+		digest = required_string(item, "sha256")
+		if policy.sha256_pattern.fullmatch(digest) is None:
+			raise LauncherUpdateError(
+				f"invalid manifest file SHA-256: {path_value}"
+			)
+		files.append(ManifestFile(path_value, size, digest))
+		last_path = path_value
+	return tuple(files)
+
+
+def signature_url(manifest_url: str) -> str:
+	parts = urlsplit(manifest_url)
+	return urlunsplit((parts.scheme, parts.netloc, parts.path + ".sig", parts.query, ""))
+
+
+def resource_url(value: str) -> str:
+	parts = urlsplit(value)
+	return urlunsplit(
+		(parts.scheme.casefold(), parts.netloc.casefold(), parts.path, parts.query, "")
+	)
+
+
+def require_https_url(value: str, label: str) -> None:
+	parts = urlsplit(value)
+	if (
+		parts.scheme.casefold() != "https"
+		or not parts.netloc
+		or parts.username is not None
+		or parts.password is not None
+		or parts.fragment
+	):
+		raise LauncherUpdateError(f"{label} must be an HTTPS URL without credentials")
+
+
+def parse_version(value: str, label: str) -> SemanticVersion:
+	try:
+		return SemanticVersion.parse(value)
+	except ReleaseModelError as exc:
+		raise LauncherUpdateError(f"invalid {label}: {value!r}: {exc}") from exc
+
+
+def parse_published_at(value: str) -> datetime:
+	try:
+		parsed = datetime.fromisoformat(value.replace("Z", "+00:00"))
+	except ValueError as exc:
+		raise LauncherUpdateError(
+			f"manifest published_at must be an ISO-8601 timestamp: {value!r}"
+		) from exc
+	if parsed.tzinfo is None or parsed.utcoffset() is None:
+		raise LauncherUpdateError("manifest published_at must include a timezone")
+	return parsed
+
+
+def cached_timestamp(value: object) -> str | None:
+	if not isinstance(value, str) or not value:
+		return None
+	try:
+		parsed = datetime.fromisoformat(value.replace("Z", "+00:00"))
+	except ValueError:
+		return None
+	if parsed.tzinfo is None or parsed.utcoffset() is None:
+		return None
+	return value
+
+
+def release_version(
+	releases: list[LauncherInstalledRelease],
+	*,
+	active: bool = False,
+	previous: bool = False,
+) -> str | None:
+	for release in releases:
+		if (active and release.active) or (previous and release.previous):
+			return release.version
+	return None
+
+
+def required_string(value: dict[str, object], key: str) -> str:
+	item = value.get(key)
+	if not isinstance(item, str) or not item:
+		raise LauncherUpdateError(f"update manifest field {key!r} must be a string")
+	return item
+
+
+def required_integer(value: dict[str, object], key: str) -> int:
+	item = value.get(key)
+	if isinstance(item, bool) or not isinstance(item, int):
+		raise LauncherUpdateError(f"update manifest field {key!r} must be an integer")
+	return item
+
+
+def required_positive_integer(value: dict[str, object], key: str) -> int:
+	item = required_integer(value, key)
+	if item <= 0:
+		raise LauncherUpdateError(
+			f"update manifest field {key!r} must be a positive integer"
+		)
+	return item
+
+
+def optional_positive_integer(value: dict[str, object], key: str) -> int | None:
+	item = value.get(key)
+	if item is None:
+		return None
+	if isinstance(item, bool) or not isinstance(item, int) or item <= 0:
+		raise LauncherUpdateError(
+			f"release history field {key!r} must be a positive integer or null"
+		)
+	return item
+
+
+def unique_json_object(pairs: list[tuple[str, object]]) -> dict[str, object]:
+	result: dict[str, object] = {}
+	for key, value in pairs:
+		if key in result:
+			raise ValueError(f"duplicate JSON key: {key}")
+		result[key] = value
+	return result
+
+
+__all__ = [
+	"UpdateParsingPolicy",
+	"cached_timestamp",
+	"optional_positive_integer",
+	"parse_history_compatibility",
+	"parse_launcher_release_history",
+	"parse_manifest_files",
+	"parse_published_at",
+	"parse_update_manifest",
+	"parse_version",
+	"release_version",
+	"require_https_url",
+	"required_integer",
+	"required_positive_integer",
+	"required_string",
+	"resource_url",
+	"signature_url",
+	"unique_json_object",
+]

src/ptlinux/launcher_updates/rollback.py

@@ -0,0 +1,476 @@
+"""Launcher rollback selection, installation, and retained-history services."""
+
+from __future__ import annotations
+
+from contextlib import AbstractContextManager
+from dataclasses import dataclass
+from datetime import datetime
+from pathlib import Path
+from typing import Callable, Mapping, Protocol
+
+from ..update_resolver import (
+	ReleaseModelError,
+	SemanticVersion,
+	UpdateResolver,
+	validate_channel,
+)
+from .models import (
+	LauncherInstalledRelease,
+	LauncherRemoteHistory,
+	LauncherRemoteRelease,
+	LauncherRollbackResult,
+	LauncherUpdateError,
+	LauncherUpdateHistory,
+	UpdateManifest,
+)
+
+
+SUPPORTED_ROLLBACK_REASONS = frozenset(
+	{
+		"manual",
+		"failed_update",
+		"failed_launch",
+		"support_recommendation",
+		"hotfix_recovery",
+	}
+)
+
+
+class RollbackPaths(Protocol):
+	@property
+	def launcher_current(self) -> Path: ...
+
+	@property
+	def launcher_previous(self) -> Path: ...
+
+	@property
+	def launcher_releases(self) -> Path: ...
+
+	@property
+	def launcher_update_state(self) -> Path: ...
+
+	def create_base_directories(self) -> None: ...
+
+	def launcher_update_archive(self, version: str) -> Path: ...
+
+
+@dataclass(frozen=True)
+class RollbackOperations:
+	mutation_lock: Callable[..., AbstractContextManager[None]]
+	recover_interrupted: Callable[..., None]
+	resolve_link: Callable[[Path, Path], Path | None]
+	validate_release: Callable[[Path], str]
+	parse_version: Callable[[str, str], SemanticVersion]
+	verify_retained_integrity: Callable[..., tuple[int, int] | None]
+	build_release_metadata: Callable[..., dict[str, object]]
+	emit_event: Callable[..., None]
+	fetch_history: Callable[..., LauncherRemoteHistory]
+	rollback_candidates: Callable[..., tuple[LauncherRemoteRelease, ...]]
+	configured_public_key: Callable[..., Path]
+	fetch_historical_manifest: Callable[..., UpdateManifest]
+	validate_manifest_compatibility: Callable[..., None]
+	precheck_install: Callable[..., None]
+	download_archive: Callable[..., None]
+	stage_release: Callable[..., Path]
+	current_config_schema: Callable[..., int]
+	validate_schema_range: Callable[..., None]
+	validate_release_compatibility: Callable[..., None]
+	activate_release: Callable[..., Path | None]
+	record_operation: Callable[..., bool]
+	write_json: Callable[[Path, object], None]
+	current_timestamp: Callable[[], str]
+
+
+def launcher_rollback_candidates(
+	history: LauncherRemoteHistory,
+	*,
+	installed_version: str,
+	selected_channel: str,
+	show_prereleases: bool | None = None,
+) -> tuple[LauncherRemoteRelease, ...]:
+	"""Resolve valid rollback choices from authenticated release history."""
+
+	try:
+		resolver = UpdateResolver(
+			release.resolver_record() for release in history.releases
+		)
+		resolved = resolver.rollback_candidates(
+			installed_version,
+			selected_channel,
+			show_prereleases=show_prereleases,
+		)
+	except ReleaseModelError as exc:
+		raise LauncherUpdateError(str(exc)) from exc
+	by_version = {release.version: release for release in history.releases}
+	return tuple(by_version[release.version] for release in resolved)
+
+
+def rollback_launcher_update(
+	paths: RollbackPaths,
+	*,
+	target_version: str | None,
+	selected_channel: str,
+	history_url: str | None,
+	public_key_path: Path | None,
+	environment: Mapping[str, str] | None,
+	timeout_seconds: float,
+	reason: str,
+	operations: RollbackOperations,
+) -> LauncherRollbackResult:
+	"""Activate a retained or authenticated historical launcher release."""
+
+	try:
+		validate_channel(selected_channel)
+	except ReleaseModelError as exc:
+		raise LauncherUpdateError(str(exc)) from exc
+	if reason not in SUPPORTED_ROLLBACK_REASONS:
+		raise LauncherUpdateError(f"unsupported rollback reason: {reason!r}")
+	paths.create_base_directories()
+	with operations.mutation_lock(paths, "launcher-rollback"):
+		operations.recover_interrupted(paths)
+		current_release = operations.resolve_link(
+			paths.launcher_current,
+			paths.launcher_releases,
+		)
+		if current_release is None:
+			raise LauncherUpdateError("the current launcher release link is missing")
+		current_version = operations.validate_release(current_release)
+		current_semantic = operations.parse_version(
+			current_version,
+			"current launcher version",
+		)
+		manifest: UpdateManifest | None = None
+		archive: Path | None = None
+		release_id: int | None = None
+		remote_target = False
+		retained_compatibility: tuple[int, int] | None = None
+		if target_version is None:
+			target_release = operations.resolve_link(
+				paths.launcher_previous,
+				paths.launcher_releases,
+			)
+			if target_release is None:
+				raise LauncherUpdateError(
+					"no previous launcher release is available"
+				)
+			target_version = operations.validate_release(target_release)
+			retained_compatibility = operations.verify_retained_integrity(
+				paths,
+				target_release,
+				target_version,
+			)
+		else:
+			try:
+				target_semantic = SemanticVersion.parse(target_version)
+			except ReleaseModelError as exc:
+				raise LauncherUpdateError(
+					f"invalid rollback version: {target_version!r}"
+				) from exc
+			if target_semantic >= current_semantic:
+				raise LauncherUpdateError(
+					f"rollback target {target_version} must be older than "
+					f"{current_version}"
+				)
+			target_release = paths.launcher_releases / target_version
+			if target_release.is_dir() and not target_release.is_symlink():
+				if operations.validate_release(target_release) != target_version:
+					raise LauncherUpdateError(
+						"retained rollback release version does not match"
+					)
+				retained_compatibility = operations.verify_retained_integrity(
+					paths,
+					target_release,
+					target_version,
+				)
+			else:
+				remote_target = True
+		assert target_version is not None
+		target_semantic = operations.parse_version(
+			target_version,
+			"rollback target version",
+		)
+		if target_semantic >= current_semantic:
+			raise LauncherUpdateError(
+				f"rollback target {target_version} must be older than "
+				f"{current_version}"
+			)
+		from_channel = current_semantic.channel
+		to_channel = target_semantic.channel
+		event_metadata = operations.build_release_metadata(
+			current_version=current_version,
+			target_version=target_version,
+			current_channel=from_channel,
+			target_channel=to_channel,
+			selected_channel=selected_channel,
+			tag=manifest.tag if manifest is not None else target_semantic.tag,
+			manifest_schema=manifest.schema if manifest is not None else None,
+			manifest_sha256=(
+				manifest.manifest_sha256 if manifest is not None else None
+			),
+			rollback=True,
+			reason=reason,
+			release_id=release_id,
+		)
+		operations.emit_event(
+			"rollback_requested",
+			metadata=event_metadata,
+			operation="launcher_rollback",
+			stage="requested",
+		)
+		if remote_target:
+			history = operations.fetch_history(
+				history_url=history_url,
+				public_key_path=public_key_path,
+				environment=environment,
+				timeout_seconds=min(timeout_seconds, 30.0),
+			)
+			candidates = operations.rollback_candidates(
+				history,
+				installed_version=current_version,
+				selected_channel=selected_channel,
+				show_prereleases=target_semantic.is_prerelease,
+			)
+			record = next(
+				(
+					release
+					for release in candidates
+					if release.version == target_version
+				),
+				None,
+			)
+			if record is None:
+				raise LauncherUpdateError(
+					f"release {target_version} is not an active rollback candidate"
+				)
+			release_id = record.release_id
+			fetched_manifest = operations.fetch_historical_manifest(
+				record,
+				public_key_path or operations.configured_public_key(environment),
+				timeout_seconds=min(timeout_seconds, 30.0),
+			)
+			operations.validate_manifest_compatibility(paths, fetched_manifest)
+			operations.precheck_install(paths, fetched_manifest)
+			manifest = fetched_manifest
+			archive = paths.launcher_update_archive(fetched_manifest.version)
+			event_metadata = operations.build_release_metadata(
+				current_version=current_version,
+				target_version=target_version,
+				current_channel=from_channel,
+				target_channel=to_channel,
+				selected_channel=selected_channel,
+				tag=fetched_manifest.tag,
+				manifest_schema=fetched_manifest.schema,
+				manifest_sha256=fetched_manifest.manifest_sha256,
+				rollback=True,
+				reason=reason,
+				release_id=release_id,
+			)
+		if manifest is not None and archive is not None:
+			operations.download_archive(
+				manifest,
+				archive,
+				timeout_seconds=timeout_seconds,
+				event_family="rollback",
+				event_metadata=event_metadata,
+			)
+		operations.emit_event(
+			"rollback_apply_started",
+			metadata=event_metadata,
+			operation="launcher_rollback",
+			stage="apply",
+		)
+		try:
+			if manifest is not None and archive is not None:
+				target_release = operations.stage_release(
+					paths,
+					archive,
+					manifest,
+				)
+			if current_release == target_release.resolve():
+				raise LauncherUpdateError(
+					"current and rollback releases are identical"
+				)
+			if manifest is not None:
+				operations.validate_manifest_compatibility(paths, manifest)
+			elif retained_compatibility is not None:
+				config_schema, minimum_config_schema = retained_compatibility
+				operations.validate_schema_range(
+					operations.current_config_schema(paths),
+					minimum_config_schema,
+					config_schema,
+					f"launcher {target_version}",
+				)
+			else:
+				operations.validate_release_compatibility(paths, target_release)
+			previous = operations.activate_release(
+				paths,
+				target_release,
+				telemetry_metadata=event_metadata,
+				restore_reason=reason,
+			)
+			if previous is None:
+				raise LauncherUpdateError(
+					"the current launcher release disappeared"
+				)
+		except BaseException as exc:
+			failed_tag = event_metadata.get("release_tag")
+			if not isinstance(failed_tag, str):
+				failed_tag = None
+			operations.emit_event(
+				"rollback_apply_failed",
+				metadata=event_metadata,
+				operation="launcher_rollback",
+				stage="apply",
+				severity="error",
+				message=str(exc),
+			)
+			operations.record_operation(
+				paths,
+				from_version=current_version,
+				to_version=target_version,
+				from_channel=from_channel,
+				to_channel=to_channel,
+				selected_channel=selected_channel,
+				result="failed",
+				rollback=True,
+				reason=reason,
+				tag=failed_tag,
+				manifest_schema=manifest.schema if manifest is not None else None,
+				manifest_sha256=(
+					manifest.manifest_sha256 if manifest is not None else None
+				),
+			)
+			raise
+		operations.emit_event(
+			"rollback_apply_success",
+			metadata=event_metadata,
+			operation="launcher_rollback",
+			stage="apply",
+		)
+		state_warning = None
+		try:
+			operations.write_json(
+				paths.launcher_update_state,
+				{
+					"schema": 1,
+					"rolled_back_at": operations.current_timestamp(),
+					"from_version": current_version,
+					"to_version": target_version,
+					"selected_channel": selected_channel,
+					"from_channel": from_channel,
+					"to_channel": to_channel,
+					"reason": reason,
+					"rollback": True,
+					"release_directory": str(target_release),
+					"previous_release": str(previous),
+				},
+			)
+		except OSError as exc:
+			state_warning = (
+				"launcher rolled back, but update history could not be saved: "
+				f"{exc}"
+			)
+		history_recorded = operations.record_operation(
+			paths,
+			from_version=current_version,
+			to_version=target_version,
+			from_channel=from_channel,
+			to_channel=to_channel,
+			selected_channel=selected_channel,
+			result="success",
+			rollback=True,
+			reason=reason,
+			tag=manifest.tag if manifest is not None else target_semantic.tag,
+			manifest_schema=manifest.schema if manifest is not None else None,
+			manifest_sha256=(
+				manifest.manifest_sha256 if manifest is not None else None
+			),
+		)
+		if not history_recorded and state_warning is None:
+			state_warning = (
+				"launcher rolled back, but the local operation history could not "
+				"be saved"
+			)
+	return LauncherRollbackResult(
+		from_version=current_version,
+		to_version=target_version,
+		current_release=str(target_release),
+		previous_release=str(previous),
+		restart_required=True,
+		from_channel=from_channel,
+		to_channel=to_channel,
+		state_recorded=state_warning is None,
+		warning=state_warning,
+	)
+
+
+def inspect_launcher_update_history(
+	paths: RollbackPaths,
+	*,
+	resolve_link: Callable[[Path, Path], Path | None],
+	validate_release: Callable[[Path], str],
+	parse_version: Callable[[str, str], SemanticVersion],
+	release_version: Callable[..., str | None],
+) -> LauncherUpdateHistory:
+	"""Return validated retained releases without trusting directory names alone."""
+
+	current = resolve_link(paths.launcher_current, paths.launcher_releases)
+	previous = resolve_link(paths.launcher_previous, paths.launcher_releases)
+	try:
+		candidates = tuple(paths.launcher_releases.iterdir())
+	except FileNotFoundError:
+		candidates = ()
+	except OSError as exc:
+		raise LauncherUpdateError(
+			f"cannot inspect installed launcher releases: {exc}"
+		) from exc
+	releases: list[LauncherInstalledRelease] = []
+	for candidate in candidates:
+		try:
+			SemanticVersion.parse(candidate.name)
+		except ReleaseModelError:
+			continue
+		try:
+			version = validate_release(candidate)
+			installed_at = (
+				datetime.fromtimestamp(candidate.stat().st_mtime)
+				.astimezone()
+				.isoformat(timespec="seconds")
+			)
+		except (LauncherUpdateError, OSError, ValueError, OverflowError):
+			continue
+		if version != candidate.name:
+			continue
+		resolved = candidate.resolve()
+		releases.append(
+			LauncherInstalledRelease(
+				version=version,
+				installed_at=installed_at,
+				directory=str(resolved),
+				active=resolved == current,
+				previous=resolved == previous,
+				channel=SemanticVersion.parse(version).channel,
+			)
+		)
+	releases.sort(
+		key=lambda release: parse_version(
+			release.version,
+			"launcher release version",
+		),
+		reverse=True,
+	)
+	return LauncherUpdateHistory(
+		current_version=release_version(releases, active=True),
+		previous_version=release_version(releases, previous=True),
+		releases=tuple(releases),
+	)
+
+
+__all__ = [
+	"RollbackOperations",
+	"RollbackPaths",
+	"SUPPORTED_ROLLBACK_REASONS",
+	"inspect_launcher_update_history",
+	"launcher_rollback_candidates",
+	"rollback_launcher_update",
+]

src/ptlinux/launcher_updates/staging.py

@@ -0,0 +1,551 @@
+"""Launcher release staging and signed file-inventory verification."""
+
+from __future__ import annotations
+
+from dataclasses import asdict
+import hashlib
+import json
+import os
+from pathlib import Path
+import re
+import shutil
+import stat
+import subprocess
+import sys
+from typing import Callable, Protocol, cast
+
+from ..update_resolver import SemanticVersion
+from .models import LauncherUpdateError, ManifestFile, UpdateManifest
+
+
+class StagingPaths(Protocol):
+	@property
+	def app_home(self) -> Path: ...
+
+	@property
+	def downloads(self) -> Path: ...
+
+	@property
+	def launcher_release_integrity(self) -> Path: ...
+
+	@property
+	def launcher_releases(self) -> Path: ...
+
+	def launcher_update_archive(self, version: str) -> Path: ...
+
+
+class DiskUsage(Protocol):
+	free: int
+
+
+def stage_and_install_release(
+	paths: StagingPaths,
+	archive: Path,
+	manifest: UpdateManifest,
+	*,
+	extract_archive: Callable[[Path, Path, str], None],
+	verify_files: Callable[[Path, UpdateManifest], None],
+	validate_release: Callable[[Path], str],
+	self_check: Callable[[Path, str], None],
+	digest_tree: Callable[[Path], str],
+	fsync_directory: Callable[[Path], None],
+	record_integrity: Callable[[Path, UpdateManifest], None],
+	process_id: Callable[[], int] = os.getpid,
+) -> Path:
+	"""Stage, verify, and retain one immutable launcher release."""
+
+	if paths.app_home.is_symlink():
+		raise LauncherUpdateError(
+			f"launcher application home cannot be a link: {paths.app_home}"
+		)
+	paths.app_home.mkdir(parents=True, exist_ok=True, mode=0o755)
+	paths.app_home.chmod(0o755)
+	if paths.launcher_releases.is_symlink():
+		raise LauncherUpdateError(
+			f"launcher release directory cannot be a link: {paths.launcher_releases}"
+		)
+	paths.launcher_releases.mkdir(parents=True, exist_ok=True, mode=0o755)
+	paths.launcher_releases.chmod(0o755)
+	staging = paths.launcher_releases / (
+		f".{manifest.version}.{process_id()}.staging"
+	)
+	if staging.exists() or staging.is_symlink():
+		raise LauncherUpdateError(f"launcher staging path already exists: {staging}")
+	staging.mkdir(mode=0o700)
+	try:
+		extract_archive(archive, staging, manifest.version)
+		verify_files(staging, manifest)
+		staged_version = validate_release(staging)
+		if staged_version != manifest.version:
+			raise LauncherUpdateError(
+				f"staged launcher version is {staged_version}, "
+				f"expected {manifest.version}"
+			)
+		self_check(staging, manifest.version)
+		validate_release(staging)
+		staging.chmod(0o755)
+		destination = paths.launcher_releases / manifest.version
+		if destination.exists() or destination.is_symlink():
+			if not destination.is_dir() or destination.is_symlink():
+				raise LauncherUpdateError(
+					"launcher release destination is not a directory: "
+					f"{destination}"
+				)
+			validate_release(destination)
+			if digest_tree(destination) != digest_tree(staging):
+				raise LauncherUpdateError(
+					f"launcher release {manifest.version} already exists "
+					"with different contents"
+				)
+			shutil.rmtree(staging)
+		else:
+			staging.replace(destination)
+			fsync_directory(paths.launcher_releases)
+		record_integrity(destination, manifest)
+		return destination
+	except BaseException:
+		if staging.exists() and staging.is_dir() and not staging.is_symlink():
+			shutil.rmtree(staging)
+		raise
+
+
+def verify_manifest_files(
+	release: Path,
+	manifest: UpdateManifest,
+	*,
+	hash_file: Callable[[Path], str],
+) -> None:
+	verify_file_inventory(release, manifest.files, hash_file=hash_file)
+
+
+def verify_file_inventory(
+	release: Path,
+	files: tuple[ManifestFile, ...],
+	*,
+	hash_file: Callable[[Path], str],
+) -> None:
+	"""Verify that a release exactly matches its signed file inventory."""
+
+	if not files:
+		return
+	expected = {entry.path: entry for entry in files}
+	actual: set[str] = set()
+	for path in release.rglob("*"):
+		if not path.is_file():
+			continue
+		relative = path.relative_to(release).as_posix()
+		actual.add(relative)
+		entry = expected.get(relative)
+		if entry is None:
+			raise LauncherUpdateError(
+				"launcher archive file is absent from its signed manifest: "
+				f"{relative}"
+			)
+		if path.stat().st_size != entry.size or hash_file(path) != entry.sha256:
+			raise LauncherUpdateError(
+				"launcher archive file does not match its signed manifest: "
+				f"{relative}"
+			)
+	missing = sorted(set(expected).difference(actual))
+	if missing:
+		raise LauncherUpdateError(
+			"launcher archive is missing signed manifest files: "
+			+ ", ".join(missing)
+		)
+
+
+def write_release_integrity_record(
+	integrity_directory: Path,
+	releases_directory: Path,
+	release: Path,
+	manifest: UpdateManifest,
+	*,
+	write_json: Callable[[Path, object], None],
+) -> None:
+	if not manifest.files:
+		return
+	if integrity_directory.is_symlink():
+		raise LauncherUpdateError(
+			"launcher release-integrity directory cannot be a link: "
+			f"{integrity_directory}"
+		)
+	integrity_directory.mkdir(parents=True, exist_ok=True, mode=0o700)
+	integrity_directory.chmod(0o700)
+	if release.resolve() != (releases_directory / manifest.version).resolve():
+		raise LauncherUpdateError(
+			"launcher integrity record release path is inconsistent"
+		)
+	write_json(
+		integrity_directory / f"{manifest.version}.json",
+		{
+			"schema": 1,
+			"version": manifest.version,
+			"channel": manifest.channel,
+			"tag": manifest.tag or SemanticVersion.parse(manifest.version).tag,
+			"manifest_schema": manifest.schema,
+			"manifest_sha256": manifest.manifest_sha256,
+			"config_schema": manifest.config_schema,
+			"minimum_config_schema": manifest.minimum_config_schema,
+			"files": [asdict(entry) for entry in manifest.files],
+		},
+	)
+
+
+def verify_retained_release_integrity(
+	integrity_directory: Path,
+	release: Path,
+	version: str,
+	*,
+	maximum_record_bytes: int,
+	sha256_pattern: re.Pattern[str],
+	unique_json_object: Callable[[list[tuple[str, object]]], dict[str, object]],
+	parse_version: Callable[[str, str], SemanticVersion],
+	required_positive_integer: Callable[[dict[str, object], str], int],
+	parse_manifest_files: Callable[[object], tuple[ManifestFile, ...]],
+	verify_inventory: Callable[[Path, tuple[ManifestFile, ...]], None],
+) -> tuple[int, int] | None:
+	"""Verify a retained release against its install-time signed inventory."""
+
+	record = integrity_directory / f"{version}.json"
+	try:
+		if record.is_symlink():
+			raise LauncherUpdateError(
+				f"launcher integrity record cannot be a link: {record}"
+			)
+		data = record.read_bytes()
+	except FileNotFoundError:
+		return None
+	except OSError as exc:
+		raise LauncherUpdateError(
+			f"cannot read launcher integrity record: {exc}"
+		) from exc
+	if not data or len(data) > maximum_record_bytes:
+		raise LauncherUpdateError("launcher integrity record has an invalid size")
+	try:
+		value = json.loads(
+			data.decode("utf-8"),
+			object_pairs_hook=unique_json_object,
+		)
+	except (UnicodeError, json.JSONDecodeError, ValueError) as exc:
+		raise LauncherUpdateError(
+			f"launcher integrity record is invalid: {exc}"
+		) from exc
+	if not isinstance(value, dict) or value.get("schema") != 1:
+		raise LauncherUpdateError(
+			"launcher integrity record has an unsupported schema"
+		)
+	semantic = parse_version(version, "retained launcher version")
+	if (
+		value.get("version") != version
+		or value.get("channel") != semantic.channel
+		or value.get("tag") != semantic.tag
+		or value.get("manifest_schema") != 1
+	):
+		raise LauncherUpdateError(
+			"launcher integrity record identity does not match release"
+		)
+	manifest_sha256 = value.get("manifest_sha256")
+	if manifest_sha256 is not None and (
+		not isinstance(manifest_sha256, str)
+		or sha256_pattern.fullmatch(manifest_sha256) is None
+	):
+		raise LauncherUpdateError(
+			"launcher integrity record manifest hash is invalid"
+		)
+	config_schema = required_positive_integer(value, "config_schema")
+	minimum_config_schema = required_positive_integer(
+		value,
+		"minimum_config_schema",
+	)
+	if minimum_config_schema > config_schema:
+		raise LauncherUpdateError(
+			"launcher integrity record has invalid config compatibility"
+		)
+	files = parse_manifest_files(value.get("files"))
+	if not files:
+		raise LauncherUpdateError("launcher integrity record has no managed files")
+	verify_inventory(release, files)
+	return config_schema, minimum_config_schema
+
+
+def validate_release_directory(
+	release: Path,
+	*,
+	public_key_filename: str,
+	remove_bytecode_caches: Callable[[Path], None],
+	read_metadata: Callable[[Path], dict[str, object]],
+	parse_version: Callable[[str, str], SemanticVersion],
+) -> str:
+	"""Validate permissions, identity, and required compatibility files."""
+
+	if not release.is_dir() or release.is_symlink():
+		raise LauncherUpdateError(f"launcher release directory is invalid: {release}")
+	remove_bytecode_caches(release)
+	for item in (release, *release.rglob("*")):
+		if item.is_symlink():
+			raise LauncherUpdateError(
+				f"launcher release contains a symbolic link: {item}"
+			)
+		try:
+			mode = item.stat().st_mode
+		except OSError as exc:
+			raise LauncherUpdateError(
+				f"cannot inspect launcher release path {item}: {exc}"
+			) from exc
+		if mode & 0o022:
+			raise LauncherUpdateError(
+				f"launcher release path is group/world writable: {item}"
+			)
+		if not stat.S_ISDIR(mode) and not stat.S_ISREG(mode):
+			raise LauncherUpdateError(
+				f"launcher release contains a special file: {item}"
+			)
+	metadata = read_metadata(release)
+	version = metadata.get("version")
+	if not isinstance(version, str):
+		raise LauncherUpdateError("launcher release metadata has no version")
+	parsed_version = parse_version(version, "launcher release version")
+	channel = metadata.get("channel")
+	if channel is not None and channel != parsed_version.channel:
+		raise LauncherUpdateError(
+			"launcher release channel does not match its version"
+		)
+	tag = metadata.get("tag")
+	if tag is not None and tag != parsed_version.tag:
+		raise LauncherUpdateError("launcher release tag does not match its version")
+	for required in (
+		Path("ptlinux/__init__.py"),
+		Path("ptlinux/__main__.py"),
+		Path("ptlinux/cli.py"),
+		Path("ptlinux/self_update.py"),
+		Path("ptlinux") / public_key_filename,
+		Path("ptdiag/__init__.py"),
+		Path("ptdiag/assbin.py"),
+		Path("ptdiag/logs.py"),
+	):
+		if not (release / required).is_file():
+			raise LauncherUpdateError(f"launcher release is missing {required}")
+	bundled_gamescope = (
+		release / "ptlinux/native/gamescope-3.16.20-ubuntu26.04-amd64"
+	)
+	if bundled_gamescope.exists():
+		mode = bundled_gamescope.stat().st_mode
+		if not stat.S_ISREG(mode) or not mode & 0o111:
+			raise LauncherUpdateError(
+				"launcher release contains a non-executable Gamescope "
+				"compatibility binary"
+			)
+	return version
+
+
+def remove_generated_bytecode_caches(release: Path) -> None:
+	"""Remove interpreter caches that are never part of a signed release."""
+
+	try:
+		cache_directories = sorted(
+			release.rglob("__pycache__"),
+			key=lambda path: len(path.parts),
+			reverse=True,
+		)
+	except OSError as exc:
+		raise LauncherUpdateError(
+			f"cannot inspect launcher bytecode caches in {release}: {exc}"
+		) from exc
+	for cache in cache_directories:
+		if cache.is_symlink() or not cache.is_dir():
+			raise LauncherUpdateError(f"launcher bytecode cache is unsafe: {cache}")
+		try:
+			entries = tuple(cache.iterdir())
+		except OSError as exc:
+			raise LauncherUpdateError(
+				f"cannot inspect launcher bytecode cache {cache}: {exc}"
+			) from exc
+		for entry in entries:
+			if (
+				entry.is_symlink()
+				or not entry.is_file()
+				or entry.suffix not in {".pyc", ".pyo"}
+			):
+				raise LauncherUpdateError(
+					"launcher bytecode cache contains an unexpected path: "
+					f"{entry}"
+				)
+		try:
+			for entry in entries:
+				entry.unlink()
+			cache.rmdir()
+		except OSError as exc:
+			raise LauncherUpdateError(
+				f"cannot remove launcher bytecode cache {cache}: {exc}"
+			) from exc
+
+
+def self_check_release(
+	release: Path,
+	expected_version: str,
+	*,
+	python_executable: str = sys.executable,
+) -> None:
+	"""Import a staged launcher in an isolated interpreter process."""
+
+	check = (
+		"import sys; "
+		"sys.path.insert(0, sys.argv[1]); "
+		"import ptlinux, ptlinux.cli, ptlinux.self_update, ptlinux.ui; "
+		"raise SystemExit(0 if ptlinux.__version__ == sys.argv[2] else 1)"
+	)
+	try:
+		result = subprocess.run(
+			[
+				python_executable,
+				"-I",
+				"-B",
+				"-c",
+				check,
+				str(release),
+				expected_version,
+			],
+			capture_output=True,
+			text=True,
+			encoding="utf-8",
+			errors="replace",
+			timeout=15,
+			check=False,
+		)
+	except (OSError, subprocess.TimeoutExpired) as exc:
+		raise LauncherUpdateError(f"could not test the staged launcher: {exc}") from exc
+	if result.returncode != 0:
+		detail = (result.stderr or result.stdout).strip()
+		raise LauncherUpdateError(
+			"staged launcher self-check failed"
+			+ (f": {detail}" if detail else "")
+		)
+
+
+def precheck_release_install(
+	paths: StagingPaths,
+	manifest: UpdateManifest,
+	*,
+	validate_config_compatibility: Callable[[UpdateManifest], None],
+	archive_matches: Callable[[Path, UpdateManifest], bool],
+	check_free_space: Callable[[Path, int, str], None],
+	maximum_extracted_bytes: int,
+) -> None:
+	"""Reject an update before download when transaction prerequisites fail."""
+
+	validate_config_compatibility(manifest)
+	for directory, label in (
+		(paths.downloads, "launcher download cache"),
+		(paths.app_home, "launcher application directory"),
+	):
+		directory.mkdir(parents=True, exist_ok=True)
+		if (
+			directory.is_symlink()
+			or not directory.is_dir()
+			or not os.access(directory, os.W_OK)
+		):
+			raise LauncherUpdateError(
+				f"{label} is not a writable directory: {directory}"
+			)
+	archive = paths.launcher_update_archive(manifest.version)
+	cache_bytes = 0 if archive_matches(archive, manifest) else manifest.archive_size
+	extracted_bytes = (
+		sum(file.size for file in manifest.files)
+		if manifest.files
+		else min(maximum_extracted_bytes, manifest.archive_size * 4)
+	)
+	check_free_space(paths.downloads, cache_bytes + 1024 * 1024, "download")
+	check_free_space(paths.app_home, extracted_bytes + 1024 * 1024, "staging")
+
+
+def require_free_space(
+	path: Path,
+	required_bytes: int,
+	label: str,
+	*,
+	disk_usage: Callable[[Path], object] = shutil.disk_usage,
+) -> None:
+	try:
+		free_bytes = cast(DiskUsage, disk_usage(path)).free
+	except OSError as exc:
+		raise LauncherUpdateError(
+			f"cannot inspect free space for {path}: {exc}"
+		) from exc
+	if free_bytes < required_bytes:
+		raise LauncherUpdateError(
+			f"insufficient free disk space for launcher {label}: "
+			f"need {required_bytes} bytes, have {free_bytes}"
+		)
+
+
+def read_release_metadata(
+	release: Path,
+	*,
+	unique_json_object: Callable[[list[tuple[str, object]]], dict[str, object]],
+) -> dict[str, object]:
+	metadata_path = release / "release.json"
+	try:
+		metadata = json.loads(
+			metadata_path.read_text(encoding="utf-8"),
+			object_pairs_hook=unique_json_object,
+		)
+	except (OSError, UnicodeDecodeError, json.JSONDecodeError, ValueError) as exc:
+		raise LauncherUpdateError(
+			f"launcher release metadata is invalid: {exc}"
+		) from exc
+	if not isinstance(metadata, dict) or metadata.get("schema") != 1:
+		raise LauncherUpdateError(
+			"launcher release metadata has an unsupported schema"
+		)
+	return metadata
+
+
+def tree_digest(root: Path, *, read_size: int) -> str:
+	"""Hash release paths, modes, sizes, and contents deterministically."""
+
+	digest = hashlib.sha256()
+	root_mode = root.stat().st_mode
+	digest.update(b"R\x00" + str(root_mode & 0o777).encode("ascii") + b"\x00")
+	for item in sorted(
+		root.rglob("*"),
+		key=lambda value: value.relative_to(root).as_posix(),
+	):
+		relative = item.relative_to(root).as_posix().encode("utf-8")
+		if item.is_symlink():
+			raise LauncherUpdateError(
+				f"launcher release contains a symbolic link: {item}"
+			)
+		state = item.stat()
+		mode = str(state.st_mode & 0o777).encode("ascii")
+		if stat.S_ISDIR(state.st_mode):
+			digest.update(b"D\x00" + relative + b"\x00" + mode + b"\x00")
+		elif stat.S_ISREG(state.st_mode):
+			digest.update(b"F\x00" + relative + b"\x00")
+			digest.update(mode + b"\x00")
+			digest.update(str(state.st_size).encode("ascii") + b"\x00")
+			with item.open("rb") as handle:
+				for chunk in iter(lambda: handle.read(read_size), b""):
+					digest.update(chunk)
+			digest.update(b"\x00")
+		else:
+			raise LauncherUpdateError(
+				f"launcher release contains a special file: {item}"
+			)
+	return digest.hexdigest()
+
+
+__all__ = [
+	"StagingPaths",
+	"precheck_release_install",
+	"read_release_metadata",
+	"remove_generated_bytecode_caches",
+	"require_free_space",
+	"self_check_release",
+	"stage_and_install_release",
+	"tree_digest",
+	"validate_release_directory",
+	"verify_file_inventory",
+	"verify_manifest_files",
+	"verify_retained_release_integrity",
+	"write_release_integrity_record",
+]

src/ptlinux/overlay.py

@@ -0,0 +1,10 @@
+"""Compatibility alias for the game runtime-view implementation."""
+
+from __future__ import annotations
+
+import sys
+
+from .game import runtime_view as _implementation
+
+
+sys.modules[__name__] = _implementation

src/ptlinux/presentation/__init__.py

@@ -0,0 +1 @@
+"""Game-window and Gamescope presentation services."""

src/ptlinux/presentation/game_window.py

@@ -1,4 +1,4 @@
-"""Map and style the real Wine game window on the host X11 display."""
+"""Map, style, and supervise the real Wine game window on X11."""
 
 from __future__ import annotations
 
@@ -13,12 +13,12 @@ import sys
 import time
 from collections.abc import Collection, Iterable, Mapping, Sequence
 
-from .desktop_identity import (
+from ..desktop_identity import (
 	APPLICATION_NAME,
 	APPLICATION_WM_CLASS,
 	APPLICATION_WM_INSTANCE,
 )
-from .window_diagnostics import WindowDiagnosticRecorder
+from ..window_diagnostics import WindowDiagnosticRecorder
 
 WINDOW_TITLE = APPLICATION_NAME
 WINDOW_DISCOVERY_TIMEOUT_SECONDS = 60.0
@@ -89,6 +89,12 @@ def _matches_game_window_title(title: str, expected_title: str) -> bool:
 	expected = expected_title.strip().casefold()
 	if not candidate or not expected:
 		return False
+	# The publisher prefixes PTR client titles with ``PTR -`` while retaining
+	# the regular game title and version suffix. Treat that publisher qualifier
+	# as part of the game title so launch readiness and later focus repair see
+	# the same client window.
+	if candidate.startswith("ptr - "):
+		candidate = candidate.removeprefix("ptr - ").lstrip()
 	return candidate == expected or candidate.startswith(f"{expected} ")
 
 

src/ptlinux/presentation/gamescope.py

@@ -1,4 +1,4 @@
-"""Launch Gamescope with low-overhead host-window resize behavior."""
+"""Launch and supervise Gamescope's resizable host presentation."""
 
 from __future__ import annotations
 
@@ -14,7 +14,7 @@ import tempfile
 import time
 from collections.abc import Mapping, Sequence
 
-from .gamebox_runtime import (
+from .game_window import (
     GAMESCOPE_HOST_FOCUS_STATE_ENV,
     GameboxRuntimeError,
     _X11,
@@ -23,7 +23,8 @@ from .gamebox_runtime import (
     _sample_window_diagnostic_details,
     _wm_state_name,
 )
-from .window_diagnostics import WindowDiagnosticRecorder
+from ..resource_paths import native_resource_path
+from ..window_diagnostics import WindowDiagnosticRecorder
 
 WINDOW_DISCOVERY_TIMEOUT_SECONDS = 10.0
 WINDOW_DISCOVERY_POLL_SECONDS = 0.05
@@ -382,7 +383,7 @@ def _read_gamescope_version(executable: str) -> tuple[int, int, int] | None:
 
 
 def _bundled_gamescope_path() -> Path:
-    return Path(__file__).resolve().parent / "native" / BUNDLED_GAMESCOPE_FILENAME
+    return native_resource_path(BUNDLED_GAMESCOPE_FILENAME)
 
 
 def _bundled_gamescope_host_supported() -> bool:

src/ptlinux/presentation/gamescope_child.py

@@ -1,4 +1,4 @@
-"""Report the nested client status to the outer Gamescope supervisor."""
+"""Run a nested client and report its status to the Gamescope supervisor."""
 
 from __future__ import annotations
 

src/ptlinux/resource_paths.py

@@ -0,0 +1,41 @@
+"""Stable locations for files shipped beside the launcher package."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+
+PACKAGE_DIRECTORY = Path(__file__).resolve().parent
+NATIVE_DIRECTORY = PACKAGE_DIRECTORY / "native"
+LAUNCHER_PUBLIC_KEY_FILENAME = "launcher-update-public.pem"
+
+
+def package_resource_path(filename: str) -> Path:
+	"""Return one package-root file without accepting a nested or unsafe name."""
+
+	_validate_filename(filename)
+	return PACKAGE_DIRECTORY / filename
+
+
+def native_resource_path(filename: str) -> Path:
+	"""Return one native package resource at its compatibility location."""
+
+	_validate_filename(filename)
+	return NATIVE_DIRECTORY / filename
+
+
+def launcher_public_key_path() -> Path:
+	"""Return the deployed launcher-update verification key path."""
+
+	return package_resource_path(LAUNCHER_PUBLIC_KEY_FILENAME)
+
+
+def _validate_filename(filename: str) -> None:
+	if (
+		not filename
+		or filename in {".", ".."}
+		or "/" in filename
+		or "\\" in filename
+		or "\x00" in filename
+	):
+		raise ValueError(f"resource filename must be one safe path component: {filename!r}")

src/ptlinux/runtime.py

@@ -0,0 +1,10 @@
+"""Compatibility alias for the game runtime implementation."""
+
+from __future__ import annotations
+
+import sys
+
+from .game import runtime as _implementation
+
+
+sys.modules[__name__] = _implementation

src/ptlinux/self_update.py

@@ -0,0 +1,10 @@
+"""Compatibility alias for launcher-update orchestration."""
+
+from __future__ import annotations
+
+import sys
+
+from .launcher_updates import service as _implementation
+
+
+sys.modules[__name__] = _implementation

src/ptlinux/server_status.py

@@ -8,6 +8,7 @@ from typing import Callable, Mapping, Protocol
 from urllib.request import Request, urlopen
 
 from . import __version__
+from .game.depot.realms import launcher_realm_name
 
 
 # This is the same publisher endpoint embedded in Windows launcher 1.0.0.64.
@@ -123,7 +124,7 @@ def _parse_realm(
 	if not service_states and players_online is None:
 		return None
 	online = all(service_states) if service_states else None
-	display_name = name[0].upper() + name[1:]
+	display_name = launcher_realm_name(name[0].upper() + name[1:])
 	return RealmServerStatus(
 		name=display_name,
 		online=online,