Method blockTask

src/prompt/WorkflowManager.ts:427–431

* 阻塞任务

(id: string, reason: string)

   * 阻塞任务
   */
  public blockTask(id: string, reason: string): WorkflowTask {
    const task = this.updateTask(id, { status: 'blocked' });
    this.addTaskNote(id, `任务被阻塞: ${reason}`);
    return task;
  }

  /**
   * 取消任务