- Update AGENTS.md with 400-line hard ceiling and sub-feature slicing rules
- Update scripts/lint_arch.ts to enforce 400 lines max with anti-formatting heuristics
- Subdivide src/shared/ui/ into layout, navbar, and admin layout fragments
- Subdivide src/features/auth/ into modular login, register, and recovery routes/fragments
- Subdivide src/features/admin/ into users, user details, apps, and audit fragments
- Maintain backwards compatibility via fragment index re-exports
- Scaffold shared UI fragments and styles in src/shared/ui/
- Implement full Auth vertical slice in src/features/auth/ with WebAuthn ceremonies and recovery endpoints
- Implement full Admin vertical slice in src/features/admin/ with responsive tables and mobile decks
- Add public client-side JS utilities and pure JS BIP-39 module
- Mount routes in src/main.ts and keep legacy server/ and ui/ quarantined
- Add pure JSX and API tests for Auth and Admin slices