agent-hub-henna.vercel.app: Tool list_requests was removed.

What changed

Tool list_requests was removed. Tool request_agent was removed.

What to do

If your agents call agent-hub-henna.vercel.app, pin the new snapshot, patch the affected call sites, and let a green contract check confirm the fix. If you don't use the changed tools, nothing is required, but the rest of the ecosystem just learned about it at the same moment you did.