## Summary
- Check if branch exists locally before attempting to delete it
- If branch only exists on remote, inform user to delete on GitHub
- If branch doesn't exist anywhere, treat as success (already deleted)

## Test plan
- Try deleting a branch that exists locally - should work as before
- Try deleting a branch that only exists on remote - should get helpful
error message
- Try deleting a branch that doesn't exist anywhere - should succeed
silently

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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---------
Co-authored-by: Will Chen <willchen90@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>