Add Cursor Cloud environment setup instructions

[zkWizard]

What does this PR do?

Sets up and documents the Cloud Agent development environment for RoamingEye. The only code change is a new AGENTS.md capturing durable, non-obvious run/test guidance for future agents; the dependency-refresh steps live in the Cloud Agent update script (npm ci + npx playwright install chromium), not in the repo.

Verified the full development workflow end to end in the Cloud VM (Node v22.14.0):

• npm ci — installs cleanly (155 packages, 0 vulnerabilities)
• npm run typecheck / npm run lint / npm run format:check — all clean
• npm test — 4621 unit tests pass (299 files)
• npm run build — production build passes, bundle-size budget check green
• npm run catalog:check — 7 records pass
• npm run test:e2e (smoke) — 2 passed; WebGL context acquired via SwiftShader
• npm run dev — served at http://localhost:5173 and driven in a real browser: rendered the 3D globe, geocoded "Amazon" and navigated to Brazil, switched the NDVI → land-surface-temp layer, and scrubbed the timeline across months

Note: npm run test:contract has 5 failures, but that suite is network-touching by design (it compares live NASA GIBS colormaps against pinned scales) and is not part of the verify gate — the failures are upstream palette drift, not an environment issue. This is documented in AGENTS.md.

Type of change

• Docs
• Build / CI / tooling

Checklist

• I ran npm run lint && npm run typecheck && npm run test && npm run build locally and they pass
• All my commits are signed off (git commit -s)

Screenshots / recordings

roamingeye_globe_walkthrough.mp4

Initial 3D globe render (NDVI)
Globe navigated to Amazon after search

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