Function probe 

pub async fn probe(url: &str, passport: &str, timeout_ms: u64) -> RelayOutcome

Connect to url (wss://<relay>/thread/<worldId>), join with passport, and run the wire validators on what the relay sends back. Best-effort: with a single probe client the relay may not fan a pose back (area-of-interest / no peers), so a missing pose is a note, not a failure — the pinned validators carry the spec.