[Bug] tool-call timeout is notify-only: a tool with a declared timeoutMs can hang the whole session past its budget

📝 摘要

工具调用超时只通知，即使声明timeoutMs仍可挂起。

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Summary. A `web_search` call left a session hung indefinitely (~5.5 hours, recovered only by restarting the process): the tool has a declared 60s budget, but no `tool/result` was ever recorded and the agent step never ended, so queued user messages were never processed. Root cause (DSH-side, confirm……

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GitHub 讨论 #11258 ↗

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