Scope the package as @richiesnitch/ads3-design-system, add repository +
publishConfig (GitHub Packages registry), and a publish-on-tag GitHub Actions
workflow. Add react/react-dom as devDependencies so the library build runs in
CI (they remain peerDependencies for consumers).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
