docs: update AGENTS.md with dev server startup notes

[DealPatrol]

Summary

Updates AGENTS.md with additional notes for cloud agents based on development environment setup findings:

• Added note about Next.js 16 middleware deprecation warning (cosmetic, does not affect functionality)
• Added note about Node.js 20 and pnpm being required in the VM environment

Environment Setup Verification

The following was verified during setup:

Check	Result
pnpm install	523 packages installed successfully
pnpm lint	Runs correctly (10 pre-existing errors, 24 warnings)
npx tsc --noEmit	Passes with zero errors
pnpm dev	Dev server starts on port 3000
Landing page (/)	Returns 200, renders correctly
Auth middleware	Correctly redirects /dashboard to /?error=auth_required
API endpoints	/api/auth/me, /api/auth/debug, /api/repositories, /api/analyses all respond correctly

Screenshot

RepoFuse landing page

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[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
repo-app-architect	Ready	Preview, Comment	May 5, 2026 1:23am
v0-repo-app-architect	Ready	Preview, Comment, Open in v0	May 5, 2026 1:23am

[supabase]

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