worktree

Create and manage isolated git worktrees for parallel build/test/landing work on the nub repo. Invoke (via the Skill tool) whenever you need a fresh worktree to land a change, when you want to know what `.worktreeinclude` does or how to add an entry, or when cleaning up after a merge. Encodes the one-command setup (`nub scripts/new-worktree.ts <slug>` or `node …`) that bakes in the proven recipe — worktree off origin/main (vendor/aube is plain in-tree files now, no submodule init), the shared CARGO_TARGET_DIR (`~/.cache/nub/shared-target`) that all worktrees reuse, and applying `.worktreeinclude` — plus the eagerly-pull-the-shared-tree discipline and the safe cleanup path. Pairs with the `dev-loop` build skill.