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.ControlPlane/ServiceCollectionExtensions.cs

@@ -26,7 +26,10 @@ public static class ServiceCollectionExtensions
     /// Registers all five admin-role cluster singletons + their proxies on the AkkaConfigurationBuilder.
     /// Must be called against the same builder used by <c>AkkaHostedService</c> so the singletons
     /// share the host's ActorSystem.
-    ///
+    /// </summary>
+    /// <param name="builder">The Akka configuration builder.</param>
+    /// <returns>The builder for fluent chaining.</returns>
+    /// <remarks>
     /// Wire from the fused Host's Program.cs:
     /// <code>
     /// builder.Services.AddAkka("otopcua", (ab, sp) =>
@@ -35,7 +38,7 @@ public static class ServiceCollectionExtensions
     ///     ab.WithOtOpcUaControlPlaneSingletons();
     /// });
     /// </code>
-    /// </summary>
+    /// </remarks>
     public static AkkaConfigurationBuilder WithOtOpcUaControlPlaneSingletons(this AkkaConfigurationBuilder builder)
     {
         var singletonOptions = new ClusterSingletonOptions { Role = AdminRole };