Clean branches

Remove the local leftovers of finished work, then report what was removed, what stayed, and why. There are two entry points: a sweep of the whole repository when the user asks, and one branch that merge hands over right after it verified the merge. Do not ask for confirmation along the way: safety comes from the narrow targets below, and anything that cannot be judged stays where it is.

Find the candidates

Fetch the remote first. The base is the branch the user names, otherwise the remote's advertised default branch. Read git worktree list --porcelain for registered worktrees and git branch for local branches. For folders that lost their registration, look only inside folders of the default checkout that also hold a registered linked worktree, such as .claude/worktrees/.

A worktree is a candidate when one of these holds: