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.Security/ServiceCollectionExtensions.cs

@@ -33,6 +33,7 @@ public static class ServiceCollectionExtensions
     /// </summary>
     /// <param name="services">The service collection.</param>
     /// <param name="configuration">The application configuration root.</param>
+    /// <returns>The same service collection, for chaining.</returns>
     public static IServiceCollection AddOtOpcUaAuth(this IServiceCollection services, IConfiguration configuration)
     {
         services.AddOptions<JwtOptions>().Bind(configuration.GetSection(JwtOptions.SectionName));
@@ -148,7 +149,7 @@ public static class ServiceCollectionExtensions
 
             // DriverOperator (policy NAME kept stable): may issue Reconnect/Restart commands against
             // live driver instances from the Admin UI DriverStatusPanel. The role STRINGS it requires
-            // are the canonical control-plane roles (Task 1.7): Operator (was DriverOperator) and
+            // are the canonical control-plane roles: Operator (was DriverOperator) and
             // Administrator (was FleetAdmin). Map LDAP group → role via GroupToRole in appsettings
             // (e.g. "ot-driver-operator": "Operator").
             o.AddPolicy("DriverOperator", policy =>