Agent Skills: git-sync

Syncs the current feature branch with its base or upstream branch via merge (default) or rebase, with conflict detection and stash handling. Use for ad-hoc requests like "sync my branch with main", "rebase onto main", "rebase on latest dev", "pull upstream into my fork", or "update my branch". Not for release/hotfix branch promotion or cutting versioned releases, use gitflow or git-release for those.