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 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>