Adds actual git merge functionality to ProcessMR and ProcessMRFromQueue:
- Fetch source branch from origin
- Checkout target branch and pull latest
- Check for merge conflicts using test merge
- Run configured tests with retry support
- Perform --no-ff merge with descriptive message
- Push to origin
- Return detailed ProcessResult with success/conflict/test status
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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