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/IWorkerClient.cs

@@ -19,12 +19,14 @@ public interface IWorkerClient : IAsyncDisposable
 
     /// <summary>Initiates the handshake and enters ready state.</summary>
     /// <param name="cancellationToken">Token to cancel the asynchronous operation.</param>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     Task StartAsync(CancellationToken cancellationToken);
 
     /// <summary>Sends a command to the worker and waits for a reply.</summary>
     /// <param name="command">Worker command to invoke.</param>
     /// <param name="timeout">Timeout for waiting for the reply.</param>
     /// <param name="cancellationToken">Token to cancel the asynchronous operation.</param>
+    /// <returns>The worker's reply to the command.</returns>
     Task<WorkerCommandReply> InvokeAsync(
         WorkerCommand command,
         TimeSpan timeout,
@@ -32,11 +34,13 @@ public interface IWorkerClient : IAsyncDisposable
 
     /// <summary>Reads events from the worker as they arrive.</summary>
     /// <param name="cancellationToken">Token to cancel the asynchronous operation.</param>
+    /// <returns>An asynchronous stream of worker events.</returns>
     IAsyncEnumerable<WorkerEvent> ReadEventsAsync(CancellationToken cancellationToken);
 
     /// <summary>Gracefully shuts down the worker by closing the connection.</summary>
     /// <param name="timeout">Timeout for shutdown.</param>
     /// <param name="cancellationToken">Token to cancel the asynchronous operation.</param>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     Task ShutdownAsync(TimeSpan timeout, CancellationToken cancellationToken);
 
     /// <summary>Terminates the worker process immediately with a diagnostic reason.</summary>