Auto: abcip-1.3 — array-slice read addressing

Closes #227

src/ZB.MOM.WW.OtOpcUa.Driver.AbCip/IAbCipTagRuntime.cs

@@ -69,6 +69,10 @@ public interface IAbCipTagFactory
 ///     for <c>STRING_20</c> / <c>STRING_40</c> / <c>STRING_80</c> UDTs). Threads through libplctag's
 ///     <c>str_max_capacity</c> attribute. <c>null</c> keeps libplctag's default 82-byte STRING
 ///     behaviour for back-compat.</param>
+/// <param name="ElementCount">Optional libplctag <c>ElementCount</c> override — set to <c>N</c>
+///     to issue a Rockwell array read covering <c>N</c> consecutive elements starting at the
+///     subscripted index in <see cref="TagName"/>. Drives PR abcip-1.3 array-slice support;
+///     <c>null</c> leaves libplctag's default scalar-element behaviour for back-compat.</param>
 public sealed record AbCipTagCreateParams(
     string Gateway,
     int Port,
@@ -76,4 +80,5 @@ public sealed record AbCipTagCreateParams(
     string LibplctagPlcAttribute,
     string TagName,
     TimeSpan Timeout,
-    int? StringMaxCapacity = null);
+    int? StringMaxCapacity = null,
+    int? ElementCount = null);