docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/OtOpcUaNodeManager.cs

@@ -30,13 +30,18 @@ public sealed class OtOpcUaNodeManager : CustomNodeManager2
     private readonly ConcurrentDictionary<string, FolderState> _folders = new(StringComparer.Ordinal);
     private FolderState? _root;
 
+    /// <summary>Initializes a new instance of the <see cref="OtOpcUaNodeManager"/> class with the OPC UA server and configuration.</summary>
+    /// <param name="server">The OPC UA server instance.</param>
+    /// <param name="configuration">The application configuration.</param>
     public OtOpcUaNodeManager(IServerInternal server, ApplicationConfiguration configuration)
         : base(server, configuration, DefaultNamespaceUri)
     {
         // SystemContext is initialised by the base ctor.
     }
 
+    /// <summary>Gets the count of variable nodes currently managed.</summary>
     public int VariableCount => _variables.Count;
+    /// <summary>Gets the count of folder nodes currently managed.</summary>
     public int FolderCount => _folders.Count;
 
     /// <summary>
@@ -44,6 +49,10 @@ public sealed class OtOpcUaNodeManager : CustomNodeManager2
     ///     variable node on first call; subsequent calls update Value + StatusCode +
     ///     SourceTimestamp and call <c>ClearChangeMasks</c> so subscribed clients see the change.
     /// </summary>
+    /// <param name="nodeId">The node identifier of the variable.</param>
+    /// <param name="value">The new value to write.</param>
+    /// <param name="quality">The OPC UA quality status code.</param>
+    /// <param name="sourceTimestampUtc">The timestamp of the value in UTC.</param>
     public void WriteValue(string nodeId, object? value, OpcUaQuality quality, DateTime sourceTimestampUtc)
     {
         ArgumentException.ThrowIfNullOrEmpty(nodeId);
@@ -61,6 +70,10 @@ public sealed class OtOpcUaNodeManager : CustomNodeManager2
     /// <summary>Apply an alarm-state write. Surfaced as a two-element Variable carrying
     /// <c>[active, acknowledged]</c> — proper <c>AlarmConditionState</c> + event firing
     /// comes when the F14b walker integration lands and registers real condition nodes.</summary>
+    /// <param name="alarmNodeId">The node identifier of the alarm variable.</param>
+    /// <param name="active">Whether the alarm is currently active.</param>
+    /// <param name="acknowledged">Whether the alarm has been acknowledged.</param>
+    /// <param name="sourceTimestampUtc">The timestamp of the alarm state change in UTC.</param>
     public void WriteAlarmState(string alarmNodeId, bool active, bool acknowledged, DateTime sourceTimestampUtc)
     {
         ArgumentException.ThrowIfNullOrEmpty(alarmNodeId);
@@ -82,6 +95,9 @@ public sealed class OtOpcUaNodeManager : CustomNodeManager2
     ///     folder hierarchy. Idempotent: the second call with the same id returns the cached
     ///     folder so adding child variables under it still works.
     /// </summary>
+    /// <param name="folderNodeId">The node identifier of the folder.</param>
+    /// <param name="parentNodeId">The node identifier of the parent folder; null to use the namespace root.</param>
+    /// <param name="displayName">The display name of the folder.</param>
     public void EnsureFolder(string folderNodeId, string? parentNodeId, string displayName)
     {
         ArgumentException.ThrowIfNullOrEmpty(folderNodeId);
@@ -116,6 +132,10 @@ public sealed class OtOpcUaNodeManager : CustomNodeManager2
     ///     Idempotent. Materialises Galaxy / SystemPlatform tags so they're browseable before the
     ///     Galaxy driver issues SubscribeBulk.
     /// </summary>
+    /// <param name="variableNodeId">The node identifier of the variable.</param>
+    /// <param name="parentFolderNodeId">The node identifier of the parent folder; null to use the namespace root.</param>
+    /// <param name="displayName">The display name of the variable.</param>
+    /// <param name="dataType">The OPC UA data type name (e.g., "Boolean", "Int32", "String").</param>
     public void EnsureVariable(string variableNodeId, string? parentFolderNodeId, string displayName, string dataType)
     {
         ArgumentException.ThrowIfNullOrEmpty(variableNodeId);