feat: 增加 Runner 生命周期结构化日志

internal/taskworker/worker.go

@@ -71,6 +71,28 @@ type Worker struct {
 	Backend   Backend
 	Tasks     TaskState
 	Bootstrap Bootstrap
+	OnEvent   func(Event)
+}
+
+// Event describes a backend lifecycle transition without exposing launch
+// environment values or other credentials.
+type Event struct {
+	Name         string
+	AssignmentID string
+	Executor     string
+	Phase        Phase
+}
+
+func (w Worker) event(name string, assignment taskassignment.Assignment, executor *Executor) {
+	if w.OnEvent == nil {
+		return
+	}
+	event := Event{Name: name, AssignmentID: assignment.ID}
+	if executor != nil {
+		event.Executor = executor.Name
+		event.Phase = executor.Phase
+	}
+	w.OnEvent(event)
 }
 
 // Accept completes the durable handoff from JetStream to the backend. Once it
@@ -88,6 +110,7 @@ func (w Worker) Accept(ctx context.Context, assignment taskassignment.Assignment
 		return false, err
 	}
 	if executor == nil {
+		w.event("executor_absent", assignment, nil)
 		launch, launchErr := w.launchSpec(assignment)
 		if launchErr != nil {
 			return false, launchErr
@@ -96,13 +119,18 @@ func (w Worker) Accept(ctx context.Context, assignment taskassignment.Assignment
 		if err != nil {
 			return false, err
 		}
+		w.event("executor_created", assignment, executor)
+	} else {
+		w.event("executor_found", assignment, executor)
 	}
 	if executor.IdentityTarget == "" {
+		w.event("identity_target_pending", assignment, executor)
 		return false, nil
 	}
 	if err := w.Backend.BindIdentity(ctx, executor, assignment.Identity); err != nil {
 		return false, err
 	}
+	w.event("identity_bound", assignment, executor)
 	return true, nil
 }