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/WorkerProcessLauncher.cs

@@ -58,12 +58,7 @@ public sealed class WorkerProcessLauncher : IWorkerProcessLauncher
         _logger = logger ?? NullLogger<WorkerProcessLauncher>.Instance;
     }
 
-    /// <summary>
-    /// Launches a worker process and waits for startup.
-    /// </summary>
-    /// <param name="request">Request payload.</param>
-    /// <param name="cancellationToken">Token to cancel the asynchronous operation.</param>
-    /// <returns>Handle to the launched worker process.</returns>
+    /// <inheritdoc />
     public async Task<WorkerProcessHandle> LaunchAsync(
         WorkerProcessLaunchRequest request,
         CancellationToken cancellationToken = default)