clean-worktrees

name	clean-worktrees
description	Clean git worktrees created by git-worktree-runner

1. Run git gtr list to list all worktrees.
2. For each worktree branch that is NOT the default branch (e.g. main), run git gtr rm --force {branch} to remove it.
3. Run git pull --prune to fetch latest changes and prune deleted remote branches.