{
  "task_id": "2025-12-15T21-48-00",
  "current_phase": "task-optimize",
  "current_step": 1,
  "started_at": "2025-12-15T21:48:00+08:00",
  "history": [
    {
      "timestamp": "2025-12-15T21:48:00+08:00",
      "action": "start",
      "phase": "task-optimize",
      "step": 1,
      "summary": "开始任务准备: 重写 README.md，提供快速上手指南",
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}