docs: complete XML-doc coverage and strip internal tracking IDs from code comments

Resolve all CommentChecker findings across the gateway server, worker, tests,
and .NET client (314 -> 0 real issues): add missing <returns>/<summary>/<param>
on public and test members, convert Stream/interface overrides to <inheritdoc/>,
and remove internal task/issue tracking IDs (SEC-*, IPC-*, WRK-*, GWC-*, TST-*,
Client.Dotnet-*) from shipped code documentation while preserving the design
rationale prose. Shipped comments should not carry internal bookkeeping, and
complete XML docs keep the analyzer/TreatWarningsAsErrors gate and generated API
docs clean. The 6 remaining flags are heuristic false positives (MD5, UTC-4,
capacity-1, near-1601) left intact so real documentation is not corrupted.

Claude-Session: https://claude.ai/code/session_01DMXXvNuPekkkrTEyPNxEkW

clients/dotnet/ZB.MOM.WW.MxGateway.Client/GrpcGalaxyRepositoryClientTransport.cs

@@ -10,9 +10,7 @@ internal sealed class GrpcGalaxyRepositoryClientTransport(
     MxGatewayClientOptions options,
     GalaxyRepository.GalaxyRepositoryClient rawClient) : IGalaxyRepositoryClientTransport
 {
-    /// <summary>
-    /// Gets the gateway client options.
-    /// </summary>
+    /// <inheritdoc />
     public MxGatewayClientOptions Options { get; } = options;
 
     /// <summary>
@@ -91,7 +89,16 @@ internal sealed class GrpcGalaxyRepositoryClientTransport(
         }
     }
 
-    /// <inheritdoc />
+    /// <summary>
+    /// Watches for deployment events from the Galaxy Repository server.
+    /// </summary>
+    /// <param name="request">The watch deploy events request.</param>
+    /// <param name="callOptions">gRPC call options (timeout, cancellation, etc.).</param>
+    /// <param name="cancellationToken">
+    /// A cancellation token distinct from <paramref name="callOptions"/>'s; when cancelable, it
+    /// takes precedence over the token carried by <paramref name="callOptions"/>.
+    /// </param>
+    /// <returns>An asynchronous stream of deploy events.</returns>
     public async IAsyncEnumerable<DeployEvent> WatchDeployEventsAsync(
         WatchDeployEventsRequest request,
         CallOptions callOptions,