OptionalDisplayThe participant's display name as Teams reports it.
OptionalIsWhether this participant is the bridge's own bot (so the driver can exclude it from diarization addressing).
The Teams participant id (the call's participant identity / id, stable for their presence).
The participant's meeting role.
One Teams meeting participant as the seam reports it. Platform-native and minimal — the driver maps this onto
BridgeParticipantInfo/BridgeMeetingParticipant.