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/LazyBrowseNode.cs

@@ -12,7 +12,7 @@ public sealed class LazyBrowseNode
 {
     private readonly GalaxyRepositoryClient _client;
     private readonly BrowseChildrenOptions _options;
-    // Client.Dotnet-027 (Won't Fix): this gate is used only via WaitAsync/Release and
+    // Won't Fix: this gate is used only via WaitAsync/Release and
     // never via AvailableWaitHandle, so SemaphoreSlim allocates no kernel wait handle —
     // it holds no unmanaged/OS handle to leak. It is pure managed memory whose lifetime
     // is the node's, so the type is intentionally not IDisposable: making it disposable
@@ -27,6 +27,11 @@ public sealed class LazyBrowseNode
     private IReadOnlyList<LazyBrowseNode> _children = [];
     private volatile bool _isExpanded;
 
+    /// <summary>Initializes a new instance of the <see cref="LazyBrowseNode"/> class.</summary>
+    /// <param name="client">The Galaxy Repository client used to fetch children on expansion.</param>
+    /// <param name="object">The underlying Galaxy object for this node.</param>
+    /// <param name="hasChildrenHint">Whether the server reports this node has at least one matching descendant.</param>
+    /// <param name="options">The browse options to apply when fetching children.</param>
     internal LazyBrowseNode(
         GalaxyRepositoryClient client,
         GalaxyObject @object,
@@ -66,6 +71,7 @@ public sealed class LazyBrowseNode
     ///     partially-built list.
     /// </remarks>
     /// <param name="cancellationToken">Token to observe for cancellation.</param>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     public async Task ExpandAsync(CancellationToken cancellationToken = default)
     {
         if (_isExpanded)