feat: big ahh commit

- agent+proto+backend: transfer service status
- agent: fix returning empty message on nonzero exit status
- backend: refactor collector+commander and handlers dependent on them: implement agent accounting via grpc stats handler

backend/cmd/main.go

@@ -82,10 +82,13 @@ func main() {
 		}()
 	}
 
-	// Initialize Collector gRPC service
-	coll := collector.New(logRepo)
+	// Initialize Collector (log streaming) with its own ConnTracker
+	collTracker := collector.NewConnTracker()
+	coll := collector.New(logRepo, collTracker)
 
-	cmdr := commander.New(jobRepo)
+	// Initialize ConnTracker for Commander agent lifecycle
+	cmdTracker := commander.NewConnTracker()
+	cmdr := commander.New(jobRepo, cmdTracker)
 
 	// Initialize script interpreter repository and service
 	scriptRepo := repository.NewScriptInterpreterRepo(db)
@@ -93,8 +96,9 @@ func main() {
 		log.Printf("Warning: failed to initialize script interpreters table: %v", err)
 	}
 	scriptSvc := service.NewScriptServiceWithInterpreters(h.Repo, scriptRepo)
-	scriptHandlers := handlers.NewScriptHandlers(scriptSvc, cmdr)
-	jobsHandlers := handlers.NewJobsHandlers(cmdr, scriptSvc)
+	scriptHandlers := handlers.NewScriptHandlers(scriptSvc, cmdTracker)
+	jobsHandlers := handlers.NewJobsHandlers(cmdTracker, scriptSvc,
+		os.Getenv("WHEREAMI") /* our address for redirects */)
 
 	// Initialize script management service and handlers
 	scriptManageSvc := service.NewScriptService(h.Repo)
@@ -201,6 +205,7 @@ func main() {
 		jobsGroup.Use(auth.AuthMiddleware(), handlers.RequireAdmin())
 		{
 			jobsGroup.POST("", jobsHandlers.AddJob)
+			jobsGroup.POST("/:id/wait", jobsHandlers.WaitJob)
 		}
 
 		// Agent registration
@@ -290,7 +295,11 @@ func main() {
 		MinVersion:   tls.VersionTLS12,
 	}
 
-	grpcServer := grpc.NewServer(grpc.Creds(credentials.NewTLS(tlsConfig)))
+	grpcServer := grpc.NewServer(
+		grpc.Creds(credentials.NewTLS(tlsConfig)),
+		grpc.StatsHandler(collTracker),
+		grpc.StatsHandler(cmdTracker),
+	)
 	proto.RegisterCommanderServer(grpcServer, cmdr)
 	proto.RegisterCollectorServer(grpcServer, coll)