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/Workers/WorkerProcessHandle.cs

@@ -30,7 +30,7 @@ public sealed class WorkerProcessHandle : IDisposable
     /// <summary>Gets the time when the process was launched.</summary>
     public DateTimeOffset LaunchedAt { get; }
 
-    /// <inheritdoc />
+    /// <summary>Disposes the underlying worker process.</summary>
     public void Dispose()
     {
         Process.Dispose();