git-branches-cleanuplisted

# Cleanup Branches Prune locals = merged OR remote gone. Destructive -> preview + confirm. ## Flow 0. If user mentioned keep-patterns inline (e.g. "but keep `spike/*`") -> capture them. Else assume none. Don't prompt up front 1. Parallel: - `git fetch --all --prune` - `git branch --show-current` 2. Base: user names one -> use it. Else detect: `git symbolic-ref --short refs/remotes/origin/HEAD` -> strip the `origin/`; ref missing -> `git remote set-head origin -a`, re-read; no remote -> `main`, fall back `master`. Why -> this is a delete path, and `--merged <wrong-base>` misclassifies live branches as merged. Compare against `origin/<base>`, not the local ref -> the local base is often stale or absent entirely (`git-branch-create` branches off `origin/<base>` without ever creating it), so a local-ref check either errors or reports branches as unmerged that the remote already has 3. Candidates: - **Gone**: upstream gone ``` git for-each-ref --format='%(refname:short) %(upstream:track)' refs/heads \ | awk '$2 == "[gone]" {print $1}' ``` - **Merged**: fully merged into the remote base (step 1 already fetched + pruned) ``` git branch --merged origin/<base> --format='%(refname:short)' ``` - Note: squash-merged PRs leave no merge commit, so they won't appear in **Merged**. Closing the PR deletes the remote -> they show up in **Gone** instead. The Gone bucket is the catch-all for PR-merged work - Union. **Exclude**: - cur