docs: 添加 RouterService 逻辑修复与新方法设计文档

wanshenmean

2026-03-27 4b22bcec7226c8a05c27f3c839630a31e1f38ef8

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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}