feat(agent): 支持持久化 /btw 旁路提问

agent/worker.go

@@ -450,6 +450,7 @@ func (w *Worker) execute(ctx context.Context, name string, taskID int64, as *db.
 		input = "开始执行 system 里领到的意图：只做它、只产生事实、assets、finding、做完即停。"
 	}
 
+	ctx = attachSideCapture(ctx, &opts)
 	s := agentcore.NewSession(opts)
 	defer s.Close() // release the session's background-task manager (temp dir + processes)