Registered by the app layer to persist the unified room transcript. The engine calls it for each FINAL
transcript line from a room's scribe, passing the scribe session's contextUser + provider so the sink
can write entities under the right identity. Bound once at startup (see AIBridgeEngine.SetTranscriptSink).
Registered by the app layer to persist the unified room transcript. The engine calls it for each FINAL transcript line from a room's scribe, passing the scribe session's
contextUser+providerso the sink can write entities under the right identity. Bound once at startup (seeAIBridgeEngine.SetTranscriptSink).