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/Core/ZB.MOM.WW.OtOpcUa.Core/OpcUa/IdentificationFolderBuilder.cs

@@ -5,7 +5,7 @@ namespace ZB.MOM.WW.OtOpcUa.Core.OpcUa;
 
 /// <summary>
 ///     Phase 6.4 Stream D: materializes the OPC 40010 Machinery companion-spec Identification
-///     sub-folder under an Equipment node. Reads the nine decision-#139 columns off the
+///     sub-folder under an Equipment node. Reads the nine documented columns off the
 ///     <see cref="Equipment"/> row and emits one property per non-null field.
 /// </summary>
 /// <remarks>
@@ -19,7 +19,7 @@ namespace ZB.MOM.WW.OtOpcUa.Core.OpcUa;
 ///     grant gets BadUserAccessDenied on both the Equipment node + its Identification variables.
 ///     See <c>docs/v2/acl-design.md</c> §Identification cross-reference.</para>
 ///
-///     <para>The nine fields per decision #139 are exposed exactly when they carry a non-null
+///     <para>The nine fields are exposed exactly when they carry a non-null
 ///     value. A row with all nine null produces no Identification sub-folder at all — the
 ///     caller can use <see cref="HasAnyFields(Equipment)"/> to skip the Folder call entirely
 ///     and avoid a pointless empty folder appearing in browse trees.</para>