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.OpcUaServer/Security/IOpcUaUserAuthenticator.cs

@@ -55,11 +55,7 @@ public sealed class NullOpcUaUserAuthenticator : IOpcUaUserAuthenticator
     public static readonly NullOpcUaUserAuthenticator Instance = new();
     private NullOpcUaUserAuthenticator() { }
 
-    /// <summary>Authenticates a username (always denies in this null implementation).</summary>
-    /// <param name="username">The username to authenticate.</param>
-    /// <param name="password">The cleartext password to authenticate.</param>
-    /// <param name="ct">The cancellation token.</param>
-    /// <returns>A task that returns a denial result indicating no authenticator is configured.</returns>
+    /// <inheritdoc />
     public Task<OpcUaUserAuthResult> AuthenticateUserNameAsync(string username, string password, CancellationToken ct) =>
         Task.FromResult(OpcUaUserAuthResult.Deny("No UserName authenticator is configured on this server."));
 }

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Security/OpcUaDataPlaneRoles.cs

@@ -25,7 +25,7 @@ public static class OpcUaDataPlaneRoles
 
     /// <summary>The role that grants authority to write a writable equipment-tag variable node
     /// (FreeAccess / Operate attributes). A session must carry this role for the inbound
-    /// <c>OnWriteValue</c> handler (Task 11) to route the value to the backing driver; absent it the
+    /// <c>OnWriteValue</c> handler to route the value to the backing driver; absent it the
     /// write is denied with <c>BadUserAccessDenied</c> before any driver call.</summary>
     public const string WriteOperate = "WriteOperate";
 }