Fix stale WorkerProjectReferenceTests MXAccess-interop assertion

MxAccessInteropReference_ExistsOnlyInWorkerProject asserted the MXAccess COM
interop was referenced only by MxGateway.Worker. The worker test project now
legitimately references ArchestrA.MxAccess and Interop.WNWRAPCONSUMERLib so it
can exercise the COM-facing worker code (WnWrapAlarmConsumer, the alarm
tests). Renamed to ..._ExistsOnlyInWorkerAndWorkerTestProjects, updated the
assertion to expect both projects, and made it order-independent. The
architecture invariant the test protects — the gateway/contracts never
reference MXAccess COM — still holds.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/MxGateway.Worker.Tests/ProjectStructure/WorkerProjectReferenceTests.cs

@@ -29,9 +29,16 @@ public sealed class WorkerProjectReferenceTests
         Assert.Equal("x86", ElementValue(project, "PlatformTarget"));
     }
 
-    /// <summary>Verifies that MXAccess interop reference exists only in the worker project.</summary>
+    /// <summary>
+    ///     Verifies that the MXAccess COM interop is referenced only by the
+    ///     worker project and its test project — never by the gateway server
+    ///     or the contracts project. The gateway must never load MXAccess COM
+    ///     directly (see <c>gateway.md</c>); the worker test project
+    ///     legitimately references the interop so it can exercise the
+    ///     COM-facing worker code (e.g. <c>WnWrapAlarmConsumer</c>).
+    /// </summary>
     [Fact]
-    public void MxAccessInteropReference_ExistsOnlyInWorkerProject()
+    public void MxAccessInteropReference_ExistsOnlyInWorkerAndWorkerTestProjects()
     {
         DirectoryInfo repositoryRoot = FindRepositoryRoot();
         string[] projectFiles = Directory.GetFiles(repositoryRoot.FullName, "*.csproj", SearchOption.AllDirectories)
@@ -42,9 +49,12 @@ public sealed class WorkerProjectReferenceTests
         IReadOnlyList<string> projectsWithMxAccessReference = projectFiles
             .Where(ProjectReferencesMxAccess)
             .Select(path => Path.GetFileNameWithoutExtension(path))
+            .OrderBy(name => name, StringComparer.Ordinal)
             .ToArray();
 
-        Assert.Equal(["MxGateway.Worker"], projectsWithMxAccessReference);
+        Assert.Equal(
+            ["MxGateway.Worker", "MxGateway.Worker.Tests"],
+            projectsWithMxAccessReference);
     }
 
     private static bool ProjectReferencesMxAccess(string projectPath)