Mai PR — Git-Native Pull Requests

PRs in maitake are kind: pr notes with source and target branches in targets[]. Everything lives in refs/notes/maitake — syncs with git push/pull, merges via set-union.

Quick start

# On a feature branch:
git checkout -b feature/auth
# ... make changes, commit ...

mai pr "Add auth middleware" --into main
# → mai-5c4a  feature/auth → main