app-build

Implements a clean-room clone from the recon map and app-spec - shell and foundation first, a vertical slice of the core flow, then screen-by-screen build from written specs (optionally parallel builders), with on-device features working for real and backend parts mocked or wired. Use for "클론 구현", "앱 만들어줘", "화면별 구현", "재구현", "build the clone", "implement screen S07", "rebuild this app in Expo/Next", "start building from the spec", after app-spec.