Implement LmxOpcUa server — all 6 phases complete

Full OPC UA server on .NET Framework 4.8 (x86) exposing AVEVA System
Platform Galaxy tags via MXAccess. Mirrors Galaxy object hierarchy as
OPC UA address space, translating contained-name browse paths to
tag-name runtime references.

Components implemented:
- Configuration: AppConfiguration with 4 sections, validator
- Domain: ConnectionState, Quality, Vtq, MxDataTypeMapper, error codes
- MxAccess: StaComThread, MxAccessClient (partial classes), MxProxyAdapter
  using strongly-typed ArchestrA.MxAccess COM interop
- Galaxy Repository: SQL queries (hierarchy, attributes, change detection),
  ChangeDetectionService with auto-rebuild on deploy
- OPC UA Server: LmxNodeManager (CustomNodeManager2), LmxOpcUaServer,
  OpcUaServerHost with programmatic config, SecurityPolicy None
- Status Dashboard: HTTP server with HTML/JSON/health endpoints
- Integration: Full 14-step startup, graceful shutdown, component wiring

175 tests (174 unit + 1 integration), all passing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/ZB.MOM.WW.LmxOpcUa.Tests/Wiring/MxAccessToNodeManagerWiringTest.cs

@@ -0,0 +1,49 @@
+using System.Threading.Tasks;
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.LmxOpcUa.Host.Domain;
+using ZB.MOM.WW.LmxOpcUa.Host.OpcUa;
+using ZB.MOM.WW.LmxOpcUa.Tests.Helpers;
+
+namespace ZB.MOM.WW.LmxOpcUa.Tests.Wiring
+{
+    /// <summary>
+    /// Verifies: FakeMxProxy OnDataChange → MxAccessClient → OnTagValueChanged → node manager delivery
+    /// </summary>
+    public class MxAccessToNodeManagerWiringTest
+    {
+        [Fact]
+        public async Task DataChange_ReachesGlobalHandler()
+        {
+            var mxClient = new FakeMxAccessClient();
+            string? receivedAddress = null;
+            Vtq? receivedVtq = null;
+
+            mxClient.OnTagValueChanged += (addr, vtq) =>
+            {
+                receivedAddress = addr;
+                receivedVtq = vtq;
+            };
+
+            mxClient.SimulateDataChange("TestTag.Attr", Vtq.Good(42));
+
+            receivedAddress.ShouldBe("TestTag.Attr");
+            receivedVtq.ShouldNotBeNull();
+            receivedVtq.Value.Value.ShouldBe(42);
+            receivedVtq.Value.Quality.ShouldBe(Quality.Good);
+        }
+
+        [Fact]
+        public async Task DataChange_ReachesSubscriptionCallback()
+        {
+            var mxClient = new FakeMxAccessClient();
+            Vtq? received = null;
+
+            await mxClient.SubscribeAsync("TestTag.Attr", (addr, vtq) => received = vtq);
+            mxClient.SimulateDataChange("TestTag.Attr", Vtq.Good(99));
+
+            received.ShouldNotBeNull();
+            received.Value.Value.ShouldBe(99);
+        }
+    }
+}