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/DeferredServiceLevelPublisher.cs

@@ -12,8 +12,11 @@ public sealed class DeferredServiceLevelPublisher : IServiceLevelPublisher
     private volatile IServiceLevelPublisher _inner = NullServiceLevelPublisher.Instance;
 
     /// <summary>Swap the underlying publisher. Pass null to revert to the Null no-op.</summary>
+    /// <param name="inner">The publisher implementation to use, or null to use the null publisher.</param>
     public void SetInner(IServiceLevelPublisher? inner) =>
         _inner = inner ?? NullServiceLevelPublisher.Instance;
 
+    /// <summary>Publishes a service level value to the inner publisher.</summary>
+    /// <param name="serviceLevel">The service level to publish.</param>
     public void Publish(byte serviceLevel) => _inner.Publish(serviceLevel);
 }