Add Cursor Cloud environment setup notes to AGENTS.md

[nulltask]

Summary

Sets up the Cloud Agent development environment for the be-music monorepo and documents the non-obvious startup caveats for future agents.

The only code change is an appended ## Cursor Cloud specific instructions section in AGENTS.md. No application code was modified.

Environment setup performed

• Installed Node.js 26.7.0 (repo requires >=26, .node-version pins 26.7.0) via nvm. The VM's default /exec-daemon/node is v22 and took PATH precedence, so Node 26 is prepended in ~/.bashrc.
• Node 26 dropped corepack, so the pinned pnpm 10.30.3 is installed globally under Node 26.
• Update script (runs on VM startup): prepend Node 26 to PATH, then pnpm install --frozen-lockfile --prefer-offline.

Verification

All CI-equivalent tasks pass on Node 26 + pnpm 10.30.3:

Task	Command	Result
Lint	pnpm run lint	pass (pre-existing warnings only)
Typecheck	pnpm run typecheck	pass
Build	pnpm run build	pass (all 13 packages)
Test	pnpm test	1905 passed / 149 files
CLI	pnpm run parse + pnpm run audio-render	BMS→JSON + valid 3.30s WAV
Web demo	pnpm run player:web	Vite on :5173, AUTO PLAY end-to-end

Browser demo (AUTO PLAY, end-to-end)

be_music_web_player_autoplay_demo.mp4

AUTO PLAY gameplay

Results screen: CLEARED, RANK AAA, SCORE 200000

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Status	Name	Latest Commit	Updated (UTC)
⚠️ Deployment skipped View logs	be-music-player-demo	26eca6c	Aug 18 2026, 03:26 PM