docs: strip task-tracking IDs from code comments and fill missing XML docs

Tracking IDs are review bookkeeping that rots in shipped source; the rationale they tagged is kept. Comment-only change (CommentChecker 458 -> 16 false positives).

src/ZB.MOM.WW.MxGateway.Tests/Gateway/Dashboard/DashboardLiveDataServiceTests.cs

@@ -20,6 +20,7 @@ public sealed class DashboardLiveDataServiceTests
     /// <summary>
     /// Verifies a tag already in the advise set is not subscribed again on a later read.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadAsync_WhenTagAlreadySubscribed_DoesNotResubscribe()
     {
@@ -41,6 +42,7 @@ public sealed class DashboardLiveDataServiceTests
     /// Verifies the advise set is capped: subscribing past the cap unadvises the
     /// least-recently-read tag on the worker and leaves the re-read tag advised.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadAsync_PastCap_EvictsLeastRecentlyReadTag()
     {
@@ -78,6 +80,7 @@ public sealed class DashboardLiveDataServiceTests
     /// than the cap keeps them all (a read never evicts a tag it is about to return),
     /// and the next read that subscribes anything squeezes the overshoot back out.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadAsync_WithMoreDistinctTagsThanCap_KeepsThemAllThenSelfCorrects()
     {
@@ -108,6 +111,7 @@ public sealed class DashboardLiveDataServiceTests
     /// touches nearly the whole advise set evicts only the untouched remainder, ends over
     /// the cap, and the following read trims it back.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadAsync_WhenTouchedTagsFillTheCap_EvictsOnlyUntouchedTags()
     {
@@ -135,6 +139,7 @@ public sealed class DashboardLiveDataServiceTests
     /// Verifies a tag the worker failed to advise still occupies a slot but is evicted
     /// without any unsubscribe command — there is no item handle to unadvise.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadAsync_WhenAdviseFailed_EvictsTagWithoutUnsubscribing()
     {
@@ -165,6 +170,7 @@ public sealed class DashboardLiveDataServiceTests
     /// Verifies a failed unadvise of an evicted tag does not fail the read, and the
     /// evicted tag is dropped from tracking anyway.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadAsync_WhenEvictionUnsubscribeFails_StillCompletesRead()
     {
@@ -190,10 +196,11 @@ public sealed class DashboardLiveDataServiceTests
 
     /// <summary>
     /// Verifies the <c>/browse</c> live-value seam honours
-    /// <c>MxGateway:Dashboard:ShowTagValues</c> (TST-16): with the flag off — the
+    /// <c>MxGateway:Dashboard:ShowTagValues</c>: with the flag off — the
     /// default — the value text the page renders is the redaction placeholder,
     /// never the formatted tag value.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadAsync_WhenShowTagValuesFalse_RedactsValueTextButKeepsMetadata()
     {
@@ -220,6 +227,7 @@ public sealed class DashboardLiveDataServiceTests
     }
 
     /// <summary>Verifies the formatted value is served when the flag is on.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadAsync_WhenShowTagValuesTrue_ServesFormattedValue()
     {
@@ -243,6 +251,7 @@ public sealed class DashboardLiveDataServiceTests
     /// withheld, and its diagnostic still reaches the panel. Redacting it would
     /// contradict the error the same row displays.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ReadAsync_WhenReadFailedAndShowTagValuesFalse_LeavesPlaceholderUnredacted()
     {
@@ -489,7 +498,8 @@ public sealed class DashboardLiveDataServiceTests
         {
         }
 
-        /// <inheritdoc />
+        /// <summary>Completes immediately because the fake holds no resources.</summary>
+        /// <returns>A completed value task.</returns>
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
 
         private BulkSubscribeReply Subscribe(IEnumerable<string> tagAddresses)