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/Dashboard/DashboardBrowseServiceTests.cs

@@ -142,10 +142,14 @@ public sealed class DashboardBrowseServiceTests
         /// <summary>Mutable so a single test can swap the entry mid-flight.</summary>
         public GalaxyHierarchyCacheEntry Current { get; set; } = initial;
 
-        /// <inheritdoc />
+        /// <summary>Does nothing; the stub never refreshes.</summary>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>A task that represents the asynchronous operation.</returns>
         public Task RefreshAsync(CancellationToken cancellationToken) => Task.CompletedTask;
 
-        /// <inheritdoc />
+        /// <summary>Does nothing; the stub is always considered loaded.</summary>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>A task that represents the asynchronous operation.</returns>
         public Task WaitForFirstLoadAsync(CancellationToken cancellationToken) => Task.CompletedTask;
     }
 }