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/Core/ZB.MOM.WW.OtOpcUa.Commons/OpcUa/IServiceLevelPublisher.cs

@@ -8,6 +8,8 @@ namespace ZB.MOM.WW.OtOpcUa.Commons.OpcUa;
 /// </summary>
 public interface IServiceLevelPublisher
 {
+    /// <summary>Publishes the service level value to the OPC UA Server object.</summary>
+    /// <param name="serviceLevel">The service level value (0-255).</param>
     void Publish(byte serviceLevel);
 }
 
@@ -17,6 +19,11 @@ public sealed class NullServiceLevelPublisher : IServiceLevelPublisher
 {
     public static readonly NullServiceLevelPublisher Instance = new();
     private NullServiceLevelPublisher() { }
+
+    /// <summary>Gets the last published service level value.</summary>
     public byte LastPublished { get; private set; }
+
+    /// <summary>Records the service level value without publishing.</summary>
+    /// <param name="serviceLevel">The service level value (0-255).</param>
     public void Publish(byte serviceLevel) => LastPublished = serviceLevel;
 }