Manage Git worktrees under ../.atmu/{project-name}/ with add/list/remove/prune/migrate; infer the main repo path even when run inside a worktree and use absolute paths to avoid nested directories; default to branching from main/master; copy gitignored .env/.env.* (excluding .env.example) into new worktrees; migrate uncommitted changes via stash. Use when the user runs $git-worktree ... or asks about Git worktrees / parallel branches / isolated workspaces / migrating uncommitted changes.