docs(xmldoc): fill missing XML docs + strip tracking-ID comments across src

Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Hubs/HubServiceCollectionExtensions.cs

@@ -24,6 +24,7 @@ public static class HubServiceCollectionExtensions
     ///     </list>
     /// </summary>
     /// <param name="services">The service collection.</param>
+    /// <returns>The same service collection, for chaining.</returns>
     public static IServiceCollection AddOtOpcUaDriverStatusServices(this IServiceCollection services)
     {
         services.AddSingleton<IDriverStatusSnapshotStore, InMemoryDriverStatusSnapshotStore>();
@@ -46,6 +47,7 @@ public static class HubServiceCollectionExtensions
     /// </code>
     /// </summary>
     /// <param name="builder">The Akka configuration builder.</param>
+    /// <returns>The same builder, for chaining.</returns>
     public static AkkaConfigurationBuilder WithOtOpcUaSignalRBridges(this AkkaConfigurationBuilder builder)
     {
         builder.WithActors((system, registry, resolver) =>