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.Tests/Gateway/Sessions/SessionWorkerClientFactoryFakeWorkerTests.cs

@@ -21,6 +21,7 @@ public sealed class SessionWorkerClientFactoryFakeWorkerTests : IAsyncDisposable
     /// Awaits every scripted worker task so an unhandled exception fails the owning test
     /// instead of surfacing later as an unobserved <see cref="TaskScheduler.UnobservedTaskException"/>.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     public async ValueTask DisposeAsync()
     {
         foreach (IWorkerTaskLauncher launcher in _launchers)
@@ -30,6 +31,7 @@ public sealed class SessionWorkerClientFactoryFakeWorkerTests : IAsyncDisposable
     }
 
     /// <summary>Verifies that the factory creates a ready worker client with a scripted fake worker process.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task CreateAsync_WithScriptedFakeWorker_ReturnsReadyClient()
     {
@@ -63,6 +65,7 @@ public sealed class SessionWorkerClientFactoryFakeWorkerTests : IAsyncDisposable
     }
 
     /// <summary>Verifies that a failed fake worker startup throws a worker client exception.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task CreateAsync_WhenFakeWorkerStartupFails_ThrowsWorkerClientException()
     {
@@ -83,6 +86,7 @@ public sealed class SessionWorkerClientFactoryFakeWorkerTests : IAsyncDisposable
     }
 
     /// <summary>Verifies that a worker that never sends ready times out and is killed.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task CreateAsync_WhenFakeWorkerNeverSendsReady_TimesOutAndKillsWorker()
     {
@@ -168,6 +172,7 @@ public sealed class SessionWorkerClientFactoryFakeWorkerTests : IAsyncDisposable
         /// teardown faults expected when the worker client kills or disposes the worker.
         /// </summary>
         /// <param name="timeout">Maximum time to wait for the worker task.</param>
+        /// <returns>A task that represents the asynchronous operation.</returns>
         Task ObserveWorkerTaskAsync(TimeSpan timeout);
     }