- Create docs/API.md with complete API reference
- 40+ routes documented
- Permission matrix by role
- Module breakdown (Auth, Users, Jobs, Applications, etc.)
- Error response examples
- ID format documentation
- Fix seeders to use SERIAL (not UUID) for jobs.id
- jobs.js: let DB auto-generate id
- acme.js, fictional-companies.js, epic-companies.js: same fix
- Update README.md with API documentation link
