feat(TaskService): CompleteTaskAsync添加任务历史保存逻辑

wanshenmean

2026-03-30 e4f68445aabdbbbf38845ba1af6f15348b00af02

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{"t":0,"agent":"a1dd170","agent_type":"unknown","event":"agent_stop","success":true}
{"t":0,"agent":"a5ca246","agent_type":"unknown","event":"agent_stop","success":true}