Sessions stuck permanently in "In use" state when not in use

Describe the bug

I have several sessions which were never marked no longer in use, and now do not show back up in the session list automatically. I have to /resume them every time, and accept a false warning that they're in use elsewhere. They've only ever been in use on one machine which shuts down regularly. This may be the cause of why the state was not cleaned up. However reopening these sessions does not reset the "In Use" flag, so the issue is permanent.

Affected version

GitHub Copilot CLI 1.0.84-6

Steps to reproduce the behavior

This is a guess

1. Have a session
2. Computer shuts down without cleanly terminating Agency
3. Start agency, see session is still "In Use"

Expected behavior

Sessions should not be marked in use when they are not in use.

Additional context

No response

首先重现报告的关闭场景，并检查 CLI 如何记录和重新加载会话的 "In Use" 状态。验证重新打开卡住的会话是否会改变该状态，然后确认因非正常关闭而遗留的会话不再保持隐藏，也不会触发错误的 "In Use" 警告。