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>

src/ZB.MOM.WW.LmxOpcUa.Host/Domain/QualityMapper.cs

@@ -0,0 +1,54 @@
+namespace ZB.MOM.WW.LmxOpcUa.Host.Domain
+{
+    /// <summary>
+    /// Maps MXAccess integer quality to domain Quality enum and OPC UA StatusCodes. (MXA-009, OPC-005)
+    /// </summary>
+    public static class QualityMapper
+    {
+        /// <summary>
+        /// Maps an MXAccess quality integer (OPC DA quality byte) to domain Quality.
+        /// Uses category bits: 192+ = Good, 64-191 = Uncertain, 0-63 = Bad.
+        /// </summary>
+        public static Quality MapFromMxAccessQuality(int mxQuality)
+        {
+            var b = (byte)(mxQuality & 0xFF);
+
+            // Try exact match first
+            if (System.Enum.IsDefined(typeof(Quality), b))
+                return (Quality)b;
+
+            // Fall back to category
+            if (b >= 192) return Quality.Good;
+            if (b >= 64) return Quality.Uncertain;
+            return Quality.Bad;
+        }
+
+        /// <summary>
+        /// Maps domain Quality to OPC UA StatusCode uint32.
+        /// </summary>
+        public static uint MapToOpcUaStatusCode(Quality quality)
+        {
+            return quality switch
+            {
+                Quality.Good => 0x00000000u,              // Good
+                Quality.GoodLocalOverride => 0x00D80000u, // Good_LocalOverride
+                Quality.Uncertain => 0x40000000u,         // Uncertain
+                Quality.UncertainLastUsable => 0x40900000u,
+                Quality.UncertainSensorNotAccurate => 0x40930000u,
+                Quality.UncertainEuExceeded => 0x40940000u,
+                Quality.UncertainSubNormal => 0x40950000u,
+                Quality.Bad => 0x80000000u,               // Bad
+                Quality.BadConfigError => 0x80890000u,
+                Quality.BadNotConnected => 0x808A0000u,
+                Quality.BadDeviceFailure => 0x808B0000u,
+                Quality.BadSensorFailure => 0x808C0000u,
+                Quality.BadCommFailure => 0x80050000u,
+                Quality.BadOutOfService => 0x808D0000u,
+                Quality.BadWaitingForInitialData => 0x80320000u,
+                _ => quality.IsGood() ? 0x00000000u :
+                     quality.IsUncertain() ? 0x40000000u :
+                     0x80000000u
+            };
+        }
+    }
+}