Publish stable client proto inputs

src/MxGateway.Server/Grpc/MxAccessGatewayService.cs

@@ -35,6 +35,7 @@ public sealed class MxAccessGatewayService(
                 BackendName = session.BackendName,
                 WorkerProcessId = session.WorkerProcessId ?? 0,
                 WorkerProtocolVersion = GatewayContractInfo.WorkerProtocolVersion,
+                GatewayProtocolVersion = GatewayContractInfo.GatewayProtocolVersion,
                 DefaultCommandTimeout = Google.Protobuf.WellKnownTypes.Duration.FromTimeSpan(session.CommandTimeout),
                 ProtocolStatus = MxAccessGrpcMapper.Ok(),
             };