OptionalDisplayThe participant's display name as Slack reports it.
OptionalIsWhether this participant is the bridge's own bot (so the driver can exclude it from diarization addressing).
The Slack user id of the participant (stable for their presence in the huddle).
The participant's huddle role (the huddle starter normalizes to 'Host').
One Slack huddle participant as the seam reports it. Platform-native and minimal — the driver maps this onto
BridgeParticipantInfo/BridgeMeetingParticipant. Slack huddles are relatively flat (the starter is the closest thing to a host), so roles normalize to host/co-host/participant.