docs(xmldoc): fill missing XML docs + strip tracking-ID comments across src

Adds <summary>/<param>/<returns>/<inheritdoc> where missing and removes
project bookkeeping IDs (task/tracking refs) from shipped code comments,
so the docs read cleanly and CommentChecker is quiet except for known
false positives (PLC/protocol terms, event/IEqualityComparer inheritdoc).
Doc/comment-only; no logic changed; solution builds clean.

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.OpcUaClient.Contracts/NamespaceMap.cs

@@ -48,6 +48,7 @@ public sealed class NamespaceMap
 
     /// <summary>Snapshot the namespace table from a live session.</summary>
     /// <param name="session">The OPC UA session to snapshot.</param>
+    /// <returns>A <see cref="NamespaceMap"/> capturing the session's current namespace table.</returns>
     public static NamespaceMap FromSession(ISession session)
     {
         ArgumentNullException.ThrowIfNull(session);
@@ -60,6 +61,7 @@ public sealed class NamespaceMap
     ///     a live <see cref="ISession"/>.
     /// </summary>
     /// <param name="namespaceUris">The namespace table to snapshot.</param>
+    /// <returns>A <see cref="NamespaceMap"/> capturing the given namespace table.</returns>
     public static NamespaceMap FromTable(NamespaceTable namespaceUris)
     {
         ArgumentNullException.ThrowIfNull(namespaceUris);
@@ -71,11 +73,13 @@ public sealed class NamespaceMap
 
     /// <summary>The namespace URI at the given index, or null if out of range.</summary>
     /// <param name="index">The zero-based index in the namespace table.</param>
+    /// <returns>The namespace URI at <paramref name="index"/>, or null if out of range.</returns>
     public string? UriForIndex(int index) =>
         index >= 0 && index < _uris.Length ? _uris[index] : null;
 
     /// <summary>The index for a namespace URI, or null if the URI is not in the table.</summary>
     /// <param name="uri">The namespace URI to look up.</param>
+    /// <returns>The index for <paramref name="uri"/>, or null if the URI is not in the table.</returns>
     public ushort? IndexForUri(string uri) =>
         _uriToIndex.TryGetValue(uri, out var idx) ? idx : null;
 
@@ -87,6 +91,7 @@ public sealed class NamespaceMap
     ///     address space so it survives a remote namespace-table reorder.
     /// </summary>
     /// <param name="nodeId">The NodeId to render as a stable reference.</param>
+    /// <returns>The server-stable reference string for <paramref name="nodeId"/>.</returns>
     public string ToStableReference(NodeId nodeId)
     {
         ArgumentNullException.ThrowIfNull(nodeId);
@@ -119,6 +124,7 @@ public sealed class NamespaceMap
     /// <param name="reference">The reference string to resolve (either <c>nsu=…</c> or <c>ns=N;…</c> format).</param>
     /// <param name="nodeId">On success, the resolved NodeId; on failure, <c>NodeId.Null</c>.
     ///     Use <see cref="NodeId.IsNull(NodeId)"/> — not <c>== null</c> — to test this value.</param>
+    /// <returns><c>true</c> if <paramref name="reference"/> resolved to a non-null NodeId; otherwise <c>false</c>.</returns>
     public static bool TryResolve(ISession? currentSession, string reference, out NodeId nodeId)
     {
         nodeId = NodeId.Null;