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/ServiceStartupSequenceTest.cs

@@ -0,0 +1,73 @@
+using System.Collections.Generic;
+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: OpcUaService Start() creates and wires all components with fakes.
+    /// </summary>
+    public class ServiceStartupSequenceTest
+    {
+        [Fact]
+        public void Start_WithFakes_AllComponentsCreated()
+        {
+            var config = new AppConfiguration
+            {
+                OpcUa = new OpcUaConfiguration
+                {
+                    Port = 14840,
+                    GalaxyName = "TestGalaxy",
+                    EndpointPath = "/LmxOpcUa"
+                },
+                MxAccess = new MxAccessConfiguration { ClientName = "Test" },
+                GalaxyRepository = new GalaxyRepositoryConfiguration(),
+                Dashboard = new DashboardConfiguration { Enabled = false } // Don't start HTTP listener in tests
+            };
+
+            var proxy = new FakeMxProxy();
+            var repo = new FakeGalaxyRepository
+            {
+                Hierarchy = new List<GalaxyObjectInfo>
+                {
+                    new GalaxyObjectInfo { GobjectId = 1, TagName = "TestObj", BrowseName = "TestObj", ParentGobjectId = 0, IsArea = false }
+                },
+                Attributes = new List<GalaxyAttributeInfo>
+                {
+                    new GalaxyAttributeInfo { GobjectId = 1, TagName = "TestObj", AttributeName = "TestAttr", FullTagReference = "TestObj.TestAttr", MxDataType = 5, IsArray = false }
+                }
+            };
+
+            var service = new OpcUaService(config, proxy, repo);
+            service.Start();
+
+            try
+            {
+                // Verify all components were created
+                service.MxClient.ShouldNotBeNull();
+                service.MxClient!.State.ShouldBe(ConnectionState.Connected);
+                service.Metrics.ShouldNotBeNull();
+                service.ServerHost.ShouldNotBeNull();
+                service.ChangeDetectionInstance.ShouldNotBeNull();
+                service.GalaxyStatsInstance.ShouldNotBeNull();
+                service.GalaxyStatsInstance!.GalaxyName.ShouldBe("TestGalaxy");
+                service.GalaxyStatsInstance.DbConnected.ShouldBe(true);
+                service.StatusReportInstance.ShouldNotBeNull();
+
+                // Dashboard disabled → no web server
+                service.StatusWeb.ShouldBeNull();
+
+                // MxProxy should have been registered
+                proxy.IsRegistered.ShouldBe(true);
+            }
+            finally
+            {
+                service.Stop();
+            }
+        }
+    }
+}