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

[microsoftnorman]

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