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/ShutdownCompletesTest.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.LmxOpcUa.Host;
+using ZB.MOM.WW.LmxOpcUa.Host.Configuration;
+using ZB.MOM.WW.LmxOpcUa.Host.Domain;
+using ZB.MOM.WW.LmxOpcUa.Tests.Helpers;
+
+namespace ZB.MOM.WW.LmxOpcUa.Tests.Wiring
+{
+    /// <summary>
+    /// Verifies: Start then Stop completes within 30 seconds. (SVC-004)
+    /// </summary>
+    public class ShutdownCompletesTest
+    {
+        [Fact]
+        public void Shutdown_CompletesWithin30Seconds()
+        {
+            var config = new AppConfiguration
+            {
+                OpcUa = new OpcUaConfiguration { Port = 14841, GalaxyName = "TestGalaxy" },
+                MxAccess = new MxAccessConfiguration { ClientName = "Test" },
+                Dashboard = new DashboardConfiguration { Enabled = false }
+            };
+
+            var proxy = new FakeMxProxy();
+            var repo = new FakeGalaxyRepository();
+            var service = new OpcUaService(config, proxy, repo);
+
+            service.Start();
+
+            var sw = Stopwatch.StartNew();
+            service.Stop();
+            sw.Stop();
+
+            sw.Elapsed.TotalSeconds.ShouldBeLessThan(30);
+        }
+    }
+}