Improve gateway reliability and client e2e coverage

src/MxGateway.Worker/MxAccess/MxAccessEventQueue.cs

@@ -80,7 +80,7 @@ public sealed class MxAccessEventQueue
         }
     }
 
-    public WorkerEvent Enqueue(MxEvent mxEvent)
+    public void Enqueue(MxEvent mxEvent)
     {
         if (mxEvent is null)
         {
@@ -109,8 +109,6 @@ public sealed class MxAccessEventQueue
                 Event = queuedEvent,
             };
             events.Enqueue(workerEvent);
-
-            return workerEvent.Clone();
         }
     }
 
@@ -124,7 +122,7 @@ public sealed class MxAccessEventQueue
                 return false;
             }
 
-            workerEvent = events.Dequeue().Clone();
+            workerEvent = events.Dequeue();
             return true;
         }
     }
@@ -144,7 +142,7 @@ public sealed class MxAccessEventQueue
             List<WorkerEvent> drained = new(drainCount);
             for (int index = 0; index < drainCount; index++)
             {
-                drained.Add(events.Dequeue().Clone());
+                drained.Add(events.Dequeue());
             }
 
             return drained;