ONE family skill covering iOS, Android, Flutter, and React Native with
per-framework references (ios.md, android.md, flutter.md, react-native.md),
shared scaffold/build/sign/test/ship workflow, mobile lifecycle, offline and
sync guidance, and mobile-specific testing. Ships a 5-heading human README and
a schema-v1 eval manifest with 6 cases covering build/sign, testing, and
store-readiness. Adds the README index entry and regenerates catalogs.
Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>
