Git Rebase Sync

A comprehensive rebase workflow that handles the messier parts of syncing feature branches: conflict resolution, stacked branch detection, and force-push coordination. It catches branches that point to commits in your rebase range and uses git's `--update-refs` flag to move them along instead of orphaning them on old commits. The conflict loop is methodical, stopping to ask when resolution intent isn't obvious rather than guessing at product behavior. Everything history-rewriting requires explicit confirmation with the exact command printed first. Creates backup tags automatically and defaults to `--force-with-lease` for safer pushes. Useful if you work with stacked PRs or just want guardrails around rebase operations that can quietly break things.