Cache and cpu / mem improvements for launcher when idle.

ptlinux/paths.py

@@ -91,6 +91,12 @@ class AppPaths:
 	def launcher_update_lock(self) -> Path:
 		return self.state / "launcher-update.lock"
 
+	@property
+	def launcher_update_check_cache(self) -> Path:
+		"""Display-only cache of the last authenticated update check."""
+
+		return self.cache / "launcher-update-check.json"
+
 	def launcher_update_archive(self, version: str) -> Path:
 		return self.downloads / f"pristontale-eu-linux-update-v{version}.tar.gz"
 
@@ -118,6 +124,12 @@ class AppPaths:
 	def launcher_operation_lock(self) -> Path:
 		return self.state / "launcher-operation.lock"
 
+	@property
+	def game_runtime_marker(self) -> Path:
+		"""Verified Proton/D3D preparation state for the game prefix."""
+
+		return self.state / "game-runtime.json"
+
 	@property
 	def source_game(self) -> Path:
 		return self.launcher_prefix / GAME_RELATIVE_PATH