OptionalAgentThe agent session the event is about, when it concerns one.
Epoch-ms the event happened (injected clock).
OptionalReasonA short machine-readable reason (a FloorDecisionReason for grants/denials).
Monotonic per-room sequence number (clients poll with the last Seq they saw).
OptionalToFor Yielded: the agent the floor was handed to.
What happened.
One recorded room event (turn-taking observability — the test bed renders these live).