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/queries/hierarchy.sql

@@ -0,0 +1,43 @@
+-- Galaxy Object Hierarchy for OPC UA Server
+-- Returns the parent-child hierarchy with both browse names (contained_name) and tag names.
+-- Use browse_name for OPC UA browse tree display.
+-- Use tag_name for runtime read/write tag references.
+--
+-- Derived from internal_automation_object_model_hierarchy_view2 logic:
+--   - gobject: provides hierarchy (contained_by_gobject_id, area_gobject_id) and names
+--   - template_definition: category_id filters to automation-relevant objects
+--
+-- Category IDs:
+--   1  = $WinPlatform    (platform objects)
+--   3  = $AppEngine       (application engines)
+--   4  = $InTouchViewApp  (InTouch view apps)
+--   10 = $UserDefined     (user-defined automation objects)
+--   11 = $FieldReference  (field reference objects)
+--   13 = $Area            (areas / folders)
+--   17 = $DIObject        (DI objects)
+--   24 = $DDESuiteLinkClient
+--   26 = $OPCClient
+
+SELECT DISTINCT
+    g.gobject_id,
+    g.tag_name,
+    g.contained_name,
+    CASE WHEN g.contained_name IS NULL OR g.contained_name = ''
+         THEN g.tag_name
+         ELSE g.contained_name
+    END AS browse_name,
+    CASE WHEN g.contained_by_gobject_id = 0
+         THEN g.area_gobject_id
+         ELSE g.contained_by_gobject_id
+    END AS parent_gobject_id,
+    CASE WHEN td.category_id = 13
+         THEN 1
+         ELSE 0
+    END AS is_area
+FROM gobject g
+INNER JOIN template_definition td
+    ON g.template_definition_id = td.template_definition_id
+WHERE td.category_id IN (1, 3, 4, 10, 11, 13, 17, 24, 26)
+    AND g.is_template = 0
+    AND g.deployed_package_id <> 0
+ORDER BY parent_gobject_id, g.tag_name;