docs(src): add missing XML docs and strip tracking-ID comments

Sweep of 203 source files resolving CommentChecker findings: add
<summary>/<param>/<returns>/<inheritdoc> where missing, and remove
resolved task/issue tracking markers (Tests-NNN, Worker-NNN, Server-NNN,
Task N) from code comments. Comment/doc-only — no logic changes.
Server+Tests build clean under TreatWarningsAsErrors.

src/ZB.MOM.WW.MxGateway.Server/Sessions/SessionWorkerClientFactory.cs

@@ -39,10 +39,7 @@ public sealed class SessionWorkerClientFactory : ISessionWorkerClientFactory
         _options = options.Value;
     }
 
-    /// <summary>Creates a worker client and launches the worker process.</summary>
-    /// <param name="session">The gateway session.</param>
-    /// <param name="cancellationToken">Cancellation token.</param>
-    /// <returns>The created worker client.</returns>
+    /// <inheritdoc />
     public async Task<IWorkerClient> CreateAsync(
         GatewaySession session,
         CancellationToken cancellationToken)