docs(vtags): note rename-respawn transient + write-side-only historize (integration review)

src/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer/Phase7Applier.cs

@@ -253,6 +253,10 @@ public sealed class Phase7Applier
 
         // Variables: NodeId is FOLDER-SCOPED ("<parent>/<Name>"), mirroring the equipment-tag pass.
         // Parent is the FolderPath sub-folder when set, else the equipment folder directly.
+        // NOTE (H5): a VirtualTag's Historize flag is honoured on the WRITE side only — VirtualTagHostActor
+        // forwards historized results to IHistoryWriter. It is intentionally NOT materialised as an SDK
+        // Historizing/HistoryRead variable here (no server-side OPC UA HistoryRead for vtags), so these
+        // stay plain read-only computed-output nodes.
         foreach (var v in composition.EquipmentVirtualTags)
         {
             var parent = string.IsNullOrWhiteSpace(v.FolderPath)