Using Git Bash, but all Opus 4.5 wants to do on windows is powershell

### Describe the bug

### Affected version

0.0.369 Commit: 83653a1

### Steps to reproduce the behavior

1. Windows Git Bash
2. Do anything with Copilot
3. It tries to call powershell

### Expected behavior

Use bash commands in bash.

### Additional context

_No response_