feat: Git AI integration

[acunniffe]

Related GitHub Issue

No issue. Spoke with Roo in our Git AI <> Roo slack connect. attn: @mrubens

Description

When the git-ai CLI is installed on a host, Roo Code calls git-ai checkpoint before and after every file edit so that its contributions are marked as roo-code in git-ai blame.

Since Roo Code does not have a hooks system this integration is done via the direction integration approach.

How it works:

• A singleton checks if git-ai is installed on the host. That check guards every other call to the git-ai integration so nothing runs on machines that don't have git-ai installed.
  -src/services/git-ai/ module exposes two functions — gitAiBeforeEdit and
  gitAiAfterEdit called inside the write_to_file, edit_file, edit, search_replace, apply_diff and apply_patch tools.

Test Procedure

1. Install git-ai CLI
2. Open a git repo in VS Code with Roo Code
3. Make edits using different tool types (write_to_file, edit_file, edit, search_replace,
   apply_diff, apply_patch)
4. Run git-ai blame — verify AI-edited lines are attributed to roo-code, not the
   human

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Additional Notes

discord: aidanc

Interactively review PR in Roo Code Cloud