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/Blazor/CookieAuthenticationStateProvider.cs

@@ -65,7 +65,8 @@ public sealed class CookieAuthenticationStateProvider : AuthenticationStateProvi
         }
     }
 
-    /// <inheritdoc />
+    /// <summary>Cancels the background ping loop, awaits its completion, and disposes the cancellation token source.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     public async ValueTask DisposeAsync()
     {
         _cts.Cancel();