test(worker): silence CS0649 on reflection-only FakeMxStatus fields

src/ZB.MOM.WW.MxGateway.Worker.Tests/TestSupport/NoopMxAccessServer.cs

@@ -96,6 +96,10 @@ internal sealed class NoopMxAccessServer : IMxAccessServer
 /// </summary>
 internal sealed class FakeMxStatus
 {
+    // These public fields exist solely so MxStatusProxyConverter can reflect
+    // over them by name; they are read through reflection, not directly, so the
+    // compiler's "never assigned" (CS0649) diagnostic does not apply.
+#pragma warning disable CS0649
     /// <summary>Success indicator field read by the status converter.</summary>
     public int success;
 
@@ -107,4 +111,5 @@ internal sealed class FakeMxStatus
 
     /// <summary>Status detail field read by the status converter.</summary>
     public int detail;
+#pragma warning restore CS0649
 }