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/OpcUa/OpcUaQualityMapperTests.cs

@@ -0,0 +1,60 @@
+using Opc.Ua;
+using Shouldly;
+using Xunit;
+using ZB.MOM.WW.LmxOpcUa.Host.Domain;
+using ZB.MOM.WW.LmxOpcUa.Host.OpcUa;
+
+namespace ZB.MOM.WW.LmxOpcUa.Tests.OpcUa
+{
+    public class OpcUaQualityMapperTests
+    {
+        [Fact]
+        public void Good_MapsToGoodStatusCode()
+        {
+            var sc = OpcUaQualityMapper.ToStatusCode(Quality.Good);
+            StatusCode.IsGood(sc).ShouldBe(true);
+        }
+
+        [Fact]
+        public void Bad_MapsToBadStatusCode()
+        {
+            var sc = OpcUaQualityMapper.ToStatusCode(Quality.Bad);
+            StatusCode.IsBad(sc).ShouldBe(true);
+        }
+
+        [Fact]
+        public void Uncertain_MapsToUncertainStatusCode()
+        {
+            var sc = OpcUaQualityMapper.ToStatusCode(Quality.Uncertain);
+            StatusCode.IsUncertain(sc).ShouldBe(true);
+        }
+
+        [Fact]
+        public void BadCommFailure_MapsCorrectly()
+        {
+            var sc = OpcUaQualityMapper.ToStatusCode(Quality.BadCommFailure);
+            StatusCode.IsBad(sc).ShouldBe(true);
+        }
+
+        [Fact]
+        public void FromStatusCode_Good()
+        {
+            var q = OpcUaQualityMapper.FromStatusCode(StatusCodes.Good);
+            q.ShouldBe(Quality.Good);
+        }
+
+        [Fact]
+        public void FromStatusCode_Bad()
+        {
+            var q = OpcUaQualityMapper.FromStatusCode(StatusCodes.Bad);
+            q.ShouldBe(Quality.Bad);
+        }
+
+        [Fact]
+        public void FromStatusCode_Uncertain()
+        {
+            var q = OpcUaQualityMapper.FromStatusCode(StatusCodes.Uncertain);
+            q.ShouldBe(Quality.Uncertain);
+        }
+    }
+}