docs(agents): add Cursor Cloud dev environment setup instructions

[DevVig]

Summary

Sets up and verifies the development environment for Microbridge in Cursor Cloud, and documents durable, non-obvious run/startup caveats for future agents in AGENTS.md.

No product code was changed — this PR only adds a ## Cursor Cloud specific instructions section to AGENTS.md.

Environment setup performed

• Installed system libs libudev-dev + libhidapi-dev (required for the default hid feature of the Rust daemon/CLI).
• Toolchain already present: Rust stable 1.97.1 (rustfmt + clippy), Node 22, npm 10.
• Update script (dependency refresh only): cargo fetch and npm --prefix apps/microbridge-ui ci.

Verification

Component	Command	Result
Rust lint	cargo fmt --all --check + cargo clippy --workspace --all-targets -- -D warnings	pass (0 warnings)
Rust tests	cargo test --workspace	pass
UI tests	npm test (vitest)	35 passed
UI build	npm run build	built
Adapter tests	node --test adapters/cursor/hooks/microbridge-event.test.mjs	4 passed
Daemon E2E	cargo run -p microbridged + node adapters/reference-echo/index.mjs + microbridgectl status	session driven thinking → working → awaiting_approval → working → done, reflected live in CLI and LED frame
UI (browser)	npm run dev → http://localhost:1420/	renders Microbridge popover

Hello-world (daemon E2E)

The reference adapter registered a fake session and the daemon walked it through the full state machine, observed live via microbridgectl status. The device-layer LED frame mapped the session to agent key 0 with the correct state color (#3D7EFF) and focus.

UI walkthrough

microbridge_ui_browser_demo.mp4

Microbridge UI main view

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