WinRacing V52.9 Self-Learning Ultimate Release

- Added deterministic Learning Readiness Score.
- Added READY / CAUTION / NOT_READY release gate.
- Added 10 weighted release audit checks.
- Added final advisory summary and production safety locks.
- Dashboard and API expose ultimate_release_readiness.
- Live weights remain unchanged.
- Database schema remains unchanged.
- V44-V51 logic remains immutable.
