docs: add missing XML doc comments across gateway, worker, and .NET client

Resolves 1113 documentation-completeness gaps flagged by CommentChecker
(MissingReturns, MissingInheritDoc, InheritDocMisused, MissingDoc,
MissingParam, RedundantInheritDoc) so the API surface is fully documented
and the analyzer scan is clean. Doc comments only; no code changes.

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

@@ -9,6 +9,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that TestConnectionAsync attaches the API key in request metadata and returns the Ok flag.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task TestConnectionAsync_AttachesApiKeyMetadataAndReturnsOkFlag()
     {
@@ -27,6 +28,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that TestConnectionAsync returns false when the server reports NotOk.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task TestConnectionAsync_ReturnsFalseWhenServerReportsNotOk()
     {
@@ -42,6 +44,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that GetLastDeployTimeAsync returns null when the server reports not present.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task GetLastDeployTimeAsync_ReturnsNullWhenNotPresent()
     {
@@ -58,6 +61,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that GetLastDeployTimeAsync returns the timestamp when the server reports it present.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task GetLastDeployTimeAsync_ReturnsTimestampWhenPresent()
     {
@@ -79,6 +83,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that DiscoverHierarchyAsync returns the objects from the server reply.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task DiscoverHierarchyAsync_ReturnsObjectsFromReply()
     {
@@ -141,6 +146,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that DiscoverHierarchyAsync propagates cancellation tokens to the transport.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task DiscoverHierarchyAsync_PropagatesCancellationToTransport()
     {
@@ -161,6 +167,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that TestConnectionAsync retries on transient gRPC failures.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task DiscoverHierarchyAsync_WithRepeatedPageToken_ThrowsProtocolError()
     {
@@ -184,6 +191,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that DiscoverHierarchyAsync maps typed filter options correctly to the request.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task DiscoverHierarchyAsync_WithOptions_MapsTypedFilters()
     {
@@ -218,6 +226,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that TestConnectionAsync retries on transient gRPC failures.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task TestConnectionAsync_RetriesOnTransientGrpcFailure()
     {
@@ -235,6 +244,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that DiscoverHierarchyAsync retries on transient gRPC failures.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task DiscoverHierarchyAsync_RetriesOnTransientGrpcFailure()
     {
@@ -251,6 +261,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that WatchDeployEventsAsync delivers the bootstrap event.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task WatchDeployEventsAsync_DeliversBootstrapEvent()
     {
@@ -287,6 +298,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that WatchDeployEventsAsync delivers multiple events in order.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task WatchDeployEventsAsync_DeliversMultipleEventsInOrder()
     {
@@ -325,6 +337,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that WatchDeployEventsAsync stops iteration cleanly when cancelled.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task WatchDeployEventsAsync_CancellationStopsIterationCleanly()
     {
@@ -369,6 +382,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that WatchDeployEventsAsync throws ObjectDisposedException after the client is disposed.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task WatchDeployEventsAsync_ThrowsAfterDisposal()
     {
@@ -384,6 +398,7 @@ public sealed class GalaxyRepositoryClientTests
     /// <summary>
     /// Verifies that TestConnectionAsync throws ObjectDisposedException after the client is disposed.
     /// </summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task TestConnectionAsync_ThrowsAfterDisposal()
     {