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).

clients/dotnet/ZB.MOM.WW.MxGateway.Client.Tests/MxGatewayClientSessionTests.cs

@@ -228,6 +228,7 @@ public sealed class MxGatewayClientSessionTests
     /// <see cref="MxEventStreamItem"/> with the gap populated, while normal
     /// events pass through unchanged with IsReplayGap false.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task StreamEventItemsAsync_SurfacesReplayGapSentinel()
     {
@@ -430,6 +431,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that unregister builds an unregister command with the server handle.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task UnregisterAsync_BuildsUnregisterCommand()
     {
@@ -451,6 +453,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that advise-supervisory builds the supervisory advise command.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task AdviseSupervisoryAsync_BuildsAdviseSupervisoryCommand()
     {
@@ -473,6 +476,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that add-buffered-item returns the item handle from the typed reply.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task AddBufferedItemAsync_BuildsCommandAndReturnsItemHandle()
     {
@@ -498,6 +502,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that set-buffered-update-interval builds the command with the interval.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task SetBufferedUpdateIntervalAsync_BuildsCommandWithInterval()
     {
@@ -520,6 +525,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that suspend builds the command and returns the reply status.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task SuspendAsync_BuildsCommandAndReturnsStatus()
     {
@@ -545,6 +551,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that activate builds the command and returns the reply status.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ActivateAsync_BuildsCommandAndReturnsStatus()
     {
@@ -568,6 +575,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that write-secured builds a WriteSecured command with value and user ids.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task WriteSecuredAsync_BuildsWriteSecuredCommand()
     {
@@ -598,6 +606,7 @@ public sealed class MxGatewayClientSessionTests
     /// natively. The client must surface that scripted failure (as an
     /// <see cref="MxAccessException"/>) rather than pre-validating it away.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task WriteSecuredAsync_SurfacesNativeFailureWhenNotAuthenticated()
     {
@@ -621,6 +630,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that write-secured2 builds a WriteSecured2 command with value and timestamp.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task WriteSecured2Async_BuildsWriteSecured2Command()
     {
@@ -647,6 +657,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that authenticate-user builds the command and returns the resolved user id.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task AuthenticateUserAsync_BuildsCommandAndReturnsUserId()
     {
@@ -675,6 +686,7 @@ public sealed class MxGatewayClientSessionTests
     /// must never contain the credential — the error path is built only from
     /// reply-derived diagnostics, not the request payload.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task AuthenticateUserAsync_FailureDoesNotLeakCredentialInErrorMessage()
     {
@@ -698,6 +710,7 @@ public sealed class MxGatewayClientSessionTests
     }
 
     /// <summary>Verifies that archestra-user-to-id builds the command and returns the resolved user id.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task ArchestraUserToIdAsync_BuildsCommandAndReturnsUserId()
     {