{
  "task_id": "2025-12-15T17-28-53",
  "current_phase": "task-optimize",
  "current_step": 1,
  "started_at": "2025-12-15T17:28:53+08:00",
  "history": [
    {
      "timestamp": "2025-12-15T17:28:53+08:00",
      "action": "start",
      "phase": "task-optimize",
      "step": 1,
      "summary": "开始任务准备: 阅读任务原文档"
    }
  ]
}