Copilot locks files

### Describe the bug

Copilot often locks files after handling a prompt, so subsequent prompts return errors like "Access denied.."
It leads to bad workflow by forcing me to exit copilot session and then rerun it again.

### Affected version

1.0.40

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

Start by reproducing the file-locking failure described for version 1.0.40, since no reproduction steps or code locations are provided. Trace how Copilot handles files after a prompt and verify that subsequent prompts complete without access-denied errors or restarting the session.

索引モデルが issue の本文から書いたものです。