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.Host/Drivers/DriverFactoryBootstrap.cs

@@ -36,6 +36,7 @@ public static class DriverFactoryBootstrap
     ///     <see cref="IDriverFactory"/> from DI when spawning <c>DriverHostActor</c>.
     /// </summary>
     /// <param name="services">The service collection to register driver factories with.</param>
+    /// <returns>The same service collection, for chaining.</returns>
     public static IServiceCollection AddOtOpcUaDriverFactories(this IServiceCollection services)
     {
         services.AddSingleton<DriverFactoryRegistry>(sp =>
@@ -73,6 +74,7 @@ public static class DriverFactoryBootstrap
     ///     </para>
     /// </summary>
     /// <param name="services">The service collection to register driver probes with.</param>
+    /// <returns>The same service collection, for chaining.</returns>
     public static IServiceCollection AddOtOpcUaDriverProbes(this IServiceCollection services)
     {
         services.TryAddEnumerable(ServiceDescriptor.Singleton<IDriverProbe, ModbusProbe>());