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>

gr/ddl/tables/gobject_change_log.sql

@@ -0,0 +1,16 @@
+-- Table: gobject_change_log
+CREATE TABLE [gobject_change_log] (
+    [gobject_change_log_id] int NOT NULL,
+    [gobject_id] int NOT NULL,
+    [change_date] datetime NULL,
+    [operation_id] smallint NOT NULL,
+    [user_comment] nvarchar(1024) NOT NULL DEFAULT (''),
+    [configuration_version] int NOT NULL DEFAULT ((0)),
+    [user_profile_name] nvarchar(256) NOT NULL,
+    CONSTRAINT [PK_gobject_change_log] PRIMARY KEY ([gobject_id], [operation_id])
+);
+GO
+
+ALTER TABLE [gobject_change_log] ADD FOREIGN KEY ([operation_id]) REFERENCES [lookup_operation] ([operation_id]);
+GO
+