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/ChangeDetectionToRebuildWiringTest.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.LmxOpcUa.Host.Domain;
+using ZB.MOM.WW.LmxOpcUa.Host.GalaxyRepository;
+using ZB.MOM.WW.LmxOpcUa.Host.OpcUa;
+using ZB.MOM.WW.LmxOpcUa.Tests.Helpers;
+
+namespace ZB.MOM.WW.LmxOpcUa.Tests.Wiring
+{
+    /// <summary>
+    /// Verifies: Galaxy change detection → OnGalaxyChanged → address space rebuild
+    /// </summary>
+    public class ChangeDetectionToRebuildWiringTest
+    {
+        [Fact]
+        public async Task ChangedTimestamp_TriggersRebuild()
+        {
+            var repo = new FakeGalaxyRepository
+            {
+                LastDeployTime = new DateTime(2024, 1, 1),
+                Hierarchy = new List<GalaxyObjectInfo>
+                {
+                    new GalaxyObjectInfo { GobjectId = 1, TagName = "Obj1", BrowseName = "Obj1", ParentGobjectId = 0, IsArea = false }
+                },
+                Attributes = new List<GalaxyAttributeInfo>
+                {
+                    new GalaxyAttributeInfo { GobjectId = 1, TagName = "Obj1", AttributeName = "Attr1", FullTagReference = "Obj1.Attr1", MxDataType = 5, IsArray = false }
+                }
+            };
+
+            var rebuildCount = 0;
+            var service = new ChangeDetectionService(repo, intervalSeconds: 1);
+            service.OnGalaxyChanged += () => Interlocked.Increment(ref rebuildCount);
+
+            service.Start();
+            await Task.Delay(500); // First poll triggers
+            rebuildCount.ShouldBeGreaterThanOrEqualTo(1);
+
+            // Change deploy time → should trigger rebuild
+            repo.LastDeployTime = new DateTime(2024, 2, 1);
+            await Task.Delay(1500);
+            service.Stop();
+
+            rebuildCount.ShouldBeGreaterThanOrEqualTo(2);
+            service.Dispose();
+        }
+    }
+}