Add AGENTS.md for Cursor Cloud development environment

[SillyHippy]

Summary

Adds AGENTS.md with Cursor Cloud-specific development instructions for future agents working in this repository.

What's included

• Node.js version requirements (v20 per .node-version) and PATH workaround for Cloud Agent VMs
• Key development commands table (dev, lint, typecheck, build)
• Non-obvious gotchas: prebuild scripts, ESLint scoping, TypeScript strictness settings, build output directory

Development environment verification

All checks pass on this codebase:

• Lint (npm run lint) — clean
• Typecheck (npm run typecheck) — clean
• Dev server (npm run dev) — starts on localhost:3000
• Build (npm run build) — static export produces 2459 files in out/

Demo

dev_environment_demo.mp4

Interactive walkthrough showing homepage, process serving services page, cost calculator tool, and blog listing.

Homepage loaded
Cost calculator page

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