Joseph Doherty
9dd97a27f1
Adds GatewayEndToEndMultiSubscriberTests covering three scenarios through the real gRPC StreamEvents path with AllowMultipleEventSubscribers=true: - Fan-out: two concurrent StreamEvents RPCs both receive every event the fake worker emits, in the same order (WorkerSequence matches, values indexed). - Independent cancellation: cancelling one subscriber's stream leaves the other receiving subsequent events; the session stays usable. - Cap enforcement: with MaxEventSubscribersPerSession=2 a third concurrent StreamEvents is rejected with gRPC ResourceExhausted while the first two keep streaming. Extends RecordingServerStreamWriter<T> with WaitForMessageCountAsync to allow deterministic bounded-timeout awaits for an N-message count without fixed sleeps.