docs: add Cursor Cloud specific instructions to AGENTS.md

[mikepitre]

What

Sets up the Cloud Agent development environment for this repository and records durable, non-obvious guidance for future agents under a new ## Cursor Cloud specific instructions section in AGENTS.md (symlinked to CLAUDE.md).

Environment setup

• Toolchain: Bun 1.4.0 (satisfies engines.bun >= 1.3.13), installed under ~/.bun.
• Startup update script only refreshes dependencies: installs Bun if missing, then runs bun install.

Verification (all green)

Step	Command	Result
Install	bun install --frozen-lockfile	245 packages installed
Format	bun run format:check	pass
Lint	bun run lint	pass
Typecheck	bun run typecheck	pass
Unit tests	bun run test	2687 pass / 0 fail (164 files)
Build	bun run build + bun run build:compile	bundle + native dist/clerk
Run (hello world)	clerk doctor on a Next.js + @clerk/nextjs project	full integration health check

The product is the clerk CLI. Hello-world verification ran the compiled binary's doctor command against a scaffolded Next.js + Clerk project, exercising framework detection, .env.local key validation, and keyless-app checks.

Notes

• E2E tests (bun run test:e2e) are optional and gated: they hit the production Clerk API and need the CLERK_PLATFORM_API_KEY and CLERK_CLI_TEST_APP_ID secrets plus bunx playwright install chromium. Documented in the new AGENTS.md section.

  

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