Add scripts/test-quick.sh and Makefile with:
- test-quick: runs ruff check + unit tests + smoke tests
- No real provider keys or platform accounts required
- Suitable for local branch self-test
Update tests/README.md:
- Document test-quick command
- Document test factories package
- Add smoke tests and factories directory structure
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
