Adds a Cursor slash command that implements any feature end-to-end:
deep research → TDD (Red/Green/Refactor) → integration test generation
with device pause gate → external setup checklist → verified PR.
Includes a FEATURE_REGISTRY covering 7 feature types (notifications,
auth, payments, deep links, analytics, storage, camera/media) with
per-type test scenarios, external setup steps, and files-to-touch.
Stack-aware: adapts to architecture, state management, backend,
platforms, and e2e tool from project-brief.yaml.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
