viveworker remote-pairing — Phase 2 browser smoke test

1. Start the relay in one terminal:

   cd worker-pairing && npx wrangler dev --local --port 8801

2. Serve the web/ directory in another terminal:

   cd web && npx http-server -p 8000 -c-1

   (any static server works; -c-1 disables caching so edits show up immediately)
3. Open http://127.0.0.1:8000/remote-pairing-test.html in your browser.
4. Click Start. Both peers should reach connected with matching channel bindings.
5. Type messages into either peer's input and click Send — the other peer's "Received" list updates.
6. Click Force-disconnect on a peer to simulate a network blip; you should see it transition through disconnected → opening → resuming → connected and the encrypted channel survives.

This page intentionally lives outside the main PWA shell — it loads only the remote-pairing modules, so any failure isolates to the new code.