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.Worker.Tests/MxAccess/MxAccessLiveComCreationTests.cs

@@ -15,6 +15,7 @@ public sealed class MxAccessLiveComCreationTests
     private const string DefaultLiveAddItem2Context = "TestChildObject";
 
     /// <summary>Verifies that StartAsync creates the installed MXAccess COM object on the STA thread when opted in.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [LiveMxAccessFact]
     public async Task StartAsync_WhenOptedIn_CreatesInstalledMxAccessComObjectOnSta()
     {
@@ -24,6 +25,7 @@ public sealed class MxAccessLiveComCreationTests
     }
 
     /// <summary>Verifies that Register and Unregister round-trip server handles with installed MXAccess.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [LiveMxAccessFact]
     public async Task RegisterAndUnregister_WhenOptedIn_RoundTripsInstalledMxAccessServerHandle()
     {
@@ -61,6 +63,7 @@ public sealed class MxAccessLiveComCreationTests
     }
 
     /// <summary>Verifies that AddItem and RemoveItem round-trip item handles with installed MXAccess.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [LiveMxAccessFact]
     public async Task AddItemAndRemoveItem_WhenOptedIn_RoundTripsInstalledMxAccessItemHandle()
     {
@@ -129,6 +132,7 @@ public sealed class MxAccessLiveComCreationTests
     }
 
     /// <summary>Verifies that AddItem2 and RemoveItem preserve item context with installed MXAccess.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [LiveMxAccessFact]
     public async Task AddItem2AndRemoveItem_WhenOptedIn_PreservesContextForInstalledMxAccess()
     {
@@ -198,6 +202,7 @@ public sealed class MxAccessLiveComCreationTests
     }
 
     /// <summary>Verifies that Advise and UnAdvise round-trip subscriptions with installed MXAccess.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [LiveMxAccessFact]
     public async Task AdviseAndUnAdvise_WhenOptedIn_RoundTripsInstalledMxAccessSubscription()
     {