Updated the update system to support multi channels (stable / pre-release).

ptlinux/paths.py

@@ -120,6 +120,30 @@ class AppPaths:
 
 		return self.cache / "launcher-update-check.json"
 
+	@property
+	def launcher_release_history_cache(self) -> Path:
+		"""Display-only cache of the last authenticated release history."""
+
+		return self.cache / "launcher-release-history.json"
+
+	@property
+	def launcher_update_operations(self) -> Path:
+		"""Bounded local audit trail for launcher updates and rollbacks."""
+
+		return self.state / "launcher-update-history.json"
+
+	@property
+	def launcher_update_transaction(self) -> Path:
+		"""Crash-recovery journal for launcher release-link changes."""
+
+		return self.state / "launcher-update-transaction.json"
+
+	@property
+	def launcher_release_integrity(self) -> Path:
+		"""Authenticated file inventories retained for installed releases."""
+
+		return self.state / "launcher-release-integrity"
+
 	@property
 	def container_host_repair_state(self) -> Path:
 		"""One-shot migration state for the Ubuntu Bubblewrap host repair."""