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

まず、報告されたシャットダウンのシナリオを再現し、CLI がセッションの "In Use" 状態をどのように記録して再読み込みするかを調べます。停止したセッションを再度開くことでその状態が変化するかを確認し、その後、異常終了によって残されたセッションが非表示のままになったり、誤った "In Use" 警告を発生させたりしないことを確認します。