Fire a real capability request as the seeded Demo Agent, then approve it on the next screen. Fixture persona: Thomas Masaryk.

Agent/chat path: POST /seneschal-demo/demo/stage with {"scenario":"restaurant"} → real approval URL + agent token to poll.

Paste the invite URL into your LLM agent. It will read the protocol (Accept: application/json) and register itself — same API as production, mock data underneath.