Manage isolated git worktrees: create one wired up for dev (fetch, branch from base, symlink env, install deps), list them with PR state, or safely remove merged ones. A shared bootstrap that implement-style flows can call, also usable directly. Triggers on: 'worktree', 'set up a worktree', 'new worktree', 'list worktrees', 'remove worktree', 'isolate this in a worktree', 'symlink env into worktree'.
