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/attributes_extended.sql

@@ -0,0 +1,134 @@
+-- Galaxy Object Attributes/Tags for OPC UA Server
+-- Returns all runtime-readable attributes for automation objects.
+-- Use full_tag_reference for read/write operations against the runtime.
+-- Join with hierarchy.sql results on gobject_id to place attributes in the OPC UA browse tree.
+--
+-- Two sources of attributes:
+--   1. attribute_definition (via primitive_instance) — system/primitive attributes
+--      Derived from internal_runtime_attributes view logic.
+--   2. dynamic_attribute — user-defined attributes (e.g., MachineID, MoveInFlag)
+--      Defined on templates, inherited by instances via derived_from_gobject_id chain.
+--      Requires recursive CTE to walk the template derivation hierarchy.
+--
+-- Attribute category filter (mx_attribute_category):
+--   2-11, 24 = runtime readable attributes
+--
+-- Attribute names starting with '_' are internal/hidden and excluded.
+-- dynamic_attribute '.Description' suffixed entries are metadata, excluded.
+--
+-- Array dimensions are extracted from the mx_value hex string (bytes 5-6, little-endian
+-- uint16 at hex positions 13-16). Works for both attribute_definition and dynamic_attribute.
+--
+-- Data types (mx_data_type):
+--   1 = Boolean, 2 = Integer (Int32), 3 = Float (Single), 4 = Double,
+--   5 = String, 6 = Time (DateTime), 7 = ElapsedTime (TimeSpan),
+--   8 = (reference), 13 = (enumeration), 14 = (custom), 15 = InternationalizedString, 16 = (custom)
+
+;WITH template_chain AS (
+    -- Start from each non-template instance
+    SELECT g.gobject_id, g.derived_from_gobject_id, 0 AS depth
+    FROM gobject g
+    WHERE g.is_template = 0
+    UNION ALL
+    -- Walk up the template derivation chain
+    SELECT tc.gobject_id, t.derived_from_gobject_id, tc.depth + 1
+    FROM template_chain tc
+    INNER JOIN gobject t ON t.gobject_id = tc.derived_from_gobject_id
+    WHERE tc.derived_from_gobject_id <> 0 AND tc.depth < 10
+)
+SELECT DISTINCT
+    gobject_id,
+    tag_name,
+    primitive_name,
+    attribute_name,
+    full_tag_reference,
+    mx_data_type,
+    data_type_name,
+    is_array,
+    array_dimension,
+    mx_attribute_category,
+    security_classification,
+    attribute_source
+FROM (
+    -- Part 1: System/primitive attributes (from attribute_definition)
+    SELECT
+        g.gobject_id,
+        g.tag_name,
+        pi.primitive_name,
+        ad.attribute_name,
+        CASE WHEN pi.primitive_name = ''
+             THEN g.tag_name + '.' + ad.attribute_name
+             ELSE g.tag_name + '.' + pi.primitive_name + '.' + ad.attribute_name
+        END + CASE WHEN ad.is_array = 1 THEN '[]' ELSE '' END
+            AS full_tag_reference,
+        ad.mx_data_type,
+        dt.description AS data_type_name,
+        ad.is_array,
+        CASE WHEN ad.is_array = 1
+             THEN CONVERT(int, CONVERT(varbinary(2),
+                  SUBSTRING(ad.mx_value, 15, 2) + SUBSTRING(ad.mx_value, 13, 2), 2))
+             ELSE NULL
+        END AS array_dimension,
+        ad.mx_attribute_category,
+        ad.security_classification,
+        'primitive' AS attribute_source
+    FROM gobject g
+    INNER JOIN instance i
+        ON i.gobject_id = g.gobject_id
+    INNER JOIN template_definition td
+        ON td.template_definition_id = g.template_definition_id
+        AND td.runtime_clsid <> '{00000000-0000-0000-0000-000000000000}'
+    INNER JOIN package p
+        ON p.package_id = g.checked_in_package_id
+    INNER JOIN primitive_instance pi
+        ON pi.package_id = p.package_id
+        AND pi.property_bitmask & 0x10 <> 0x10
+    INNER JOIN attribute_definition ad
+        ON ad.primitive_definition_id = pi.primitive_definition_id
+        AND ad.attribute_name NOT LIKE '[_]%'
+        AND ad.mx_attribute_category IN (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 24)
+    LEFT JOIN data_type dt
+        ON dt.mx_data_type = ad.mx_data_type
+    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
+
+    UNION ALL
+
+    -- Part 2: User-defined attributes (from dynamic_attribute via template chain)
+    SELECT
+        g.gobject_id,
+        g.tag_name,
+        '' AS primitive_name,
+        da.attribute_name,
+        g.tag_name + '.' + da.attribute_name
+            + CASE WHEN da.is_array = 1 THEN '[]' ELSE '' END
+            AS full_tag_reference,
+        da.mx_data_type,
+        dt.description AS data_type_name,
+        da.is_array,
+        CASE WHEN da.is_array = 1
+             THEN CONVERT(int, CONVERT(varbinary(2),
+                  SUBSTRING(da.mx_value, 15, 2) + SUBSTRING(da.mx_value, 13, 2), 2))
+             ELSE NULL
+        END AS array_dimension,
+        da.mx_attribute_category,
+        da.security_classification,
+        'dynamic' AS attribute_source
+    FROM template_chain tc
+    INNER JOIN dynamic_attribute da
+        ON da.gobject_id = tc.derived_from_gobject_id
+    INNER JOIN gobject g
+        ON g.gobject_id = tc.gobject_id
+    INNER JOIN template_definition td
+        ON td.template_definition_id = g.template_definition_id
+    LEFT JOIN data_type dt
+        ON dt.mx_data_type = da.mx_data_type
+    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
+        AND da.attribute_name NOT LIKE '[_]%'
+        AND da.attribute_name NOT LIKE '%.Description'
+        AND da.mx_attribute_category IN (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 24)
+) all_attributes
+ORDER BY tag_name, primitive_name, attribute_name;