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.Worker/Sta/StaRuntime.cs

@@ -86,6 +86,7 @@ public sealed class StaRuntime : IDisposable
     ///     wait. Callers must already be on the STA; the method is otherwise
     ///     safe (PeekMessage simply finds no messages).
     /// </summary>
+    /// <returns>The number of messages pumped.</returns>
     public int PumpPendingMessages() => messagePump.PumpPendingMessages();
 
     /// <summary>
@@ -212,9 +213,7 @@ public sealed class StaRuntime : IDisposable
         return stopped;
     }
 
-    /// <summary>
-    /// Releases resources used by the STA runtime.
-    /// </summary>
+    /// <inheritdoc />
     public void Dispose()
     {
         if (disposed)