Set up Cursor Cloud dev environment for OpenNOW

[zortos293]

Summary

Sets up and validates the development environment for the OpenNOW Electron client and documents non-obvious cloud caveats for future agents.

• Verified install via npm ci in opennow-stable/ (Node 22, npm).
• Ran lint, typecheck, tests, build, and locales check — all pass.
• Launched the app in dev mode (npm run dev) and exercised the core auth flow end-to-end up to NVIDIA's OAuth page.
• Added a ## Cursor Cloud specific instructions section to AGENTS.md (run commands, benign dbus/Vulkan startup noise, BYO-account auth flow, optional native streamer).

Walkthrough

Demo of the app launching and the sign-in flow reaching NVIDIA's real OAuth login page:

opennow_signin_flow_demo.mp4

OpenNOW login screen
NVIDIA OAuth page loaded

Testing

• npm run lint — pass (warnings only)
• npm run typecheck — pass
• npm test — 82 pass
• npm run build — pass
• npm run locales:check — pass
• npm run dev — app launches and sign-in flow reaches NVIDIA OAuth (manual)

Note: full gameplay/login requires a real NVIDIA GeForce NOW account (bring-your-own-account app), so the flow was validated up to the external NVIDIA login page.

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