Session-config key under which the realtime runtime hands a driver the tracks to negotiate
(RealtimeSessionRuntime.BuildClientConfig aggregates them from the active channels). It is a
CLIENT-side negotiation hint, never a provider field: a driver reads it (Gemini) or ignores it.
Session-config key under which the realtime runtime hands a driver the tracks to negotiate (
RealtimeSessionRuntime.BuildClientConfigaggregates them from the active channels). It is a CLIENT-side negotiation hint, never a provider field: a driver reads it (Gemini) or ignores it.