fix: daemon lifecycle cleanup and error logging improvements

- Refactor HealthDaemon to use a tracked session (AbortController + awaitable
  promise) instead of fire-and-forget health check loops, preventing health
  checks from running after a service is stopped
- Stop health checks before terminating daemon to avoid false crash reports
  during intentional shutdown
- Guard onExit callbacks with AbortSignal to prevent stale session callbacks
- Add logErrorOnce utility to deduplicate repeated error logging
- Fix SystemForEmbassy.stop() to capture clean promise before deleting ref
- Treat SIGTERM (signal 15) as successful exit in subcontainer sync
- Fix asError to return original Error instead of wrapping in new Error
- Remove unused ExtendedVersion import from Backups.ts

container-runtime/src/Adapters/Systems/SystemForEmbassy/index.ts

@@ -445,15 +445,14 @@ export class SystemForEmbassy implements System {
   }
   callCallback(_callback: number, _args: any[]): void {}
   async stop(): Promise<void> {
-    const { currentRunning } = this
-    this.currentRunning?.clean()
+    const clean = this.currentRunning?.clean({
+      timeout: fromDuration(
+        (this.manifest.main["sigterm-timeout"] as any) || "30s",
+      ),
+    })
     delete this.currentRunning
-    if (currentRunning) {
-      await currentRunning.clean({
-        timeout: fromDuration(
-          (this.manifest.main["sigterm-timeout"] as any) || "30s",
-        ),
-      })
+    if (clean) {
+      await clean
     }
   }