Mechanical path swap: useArchy.ts now lives at aiui/packages/app/... in this repo (D-19), not the old separate clone. Drops the separate-branch/ push language. Verified paths and referenced symbols still exist and at essentially the same line numbers post-subtree-import; task content and must_haves are otherwise unchanged. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>