Add AGENTS.md with Cursor Cloud development setup instructions

[aj327]

Adds AGENTS.md with Cursor Cloud specific instructions for developing in this multi-project workshop repository.

What's included

• Repository structure overview (sub-projects, ports, capabilities)
• Dev commands for each sub-project (startup-stress-test, hat-photo, slides-react, linkedout teams 1-5)
• Known issues (pre-existing lint errors, Vite CJS deprecation warnings)
• Testing guidance (lint, build, manual browser testing)
• Cursor hook documentation (.cursor/hooks/require-member.sh)

Environment verification

All sub-projects were verified working:

Check	Result
npm install (all 8 sub-projects)	Pass
npm run lint (startup-stress-test)	Pre-existing errors (not new)
npm run lint (hat-photo)	Pass
npm run lint (slides-react)	Pass
npm run build (all sub-projects)	Pass
Dev servers (ports 5173, 5174, 3001)	All responding HTTP 200

Demo

Three apps running simultaneously: Startup Stress Tester, Hat Photo, and LinkedOut.