fix(s7): treat ArrayCount>=1 as array so 1-element arrays read as arrays (review I-2)

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7/S7Driver.cs

@@ -442,11 +442,12 @@ public sealed class S7Driver
             ? parsed
             : S7AddressParser.Parse(tag.Address);
 
-        // Array path: a tag with a declared count > 1 reads a CONTIGUOUS block of
+        // Array path: a tag with a declared count >= 1 reads a CONTIGUOUS block of
         // count × element-bytes in a SINGLE round-trip (Plc.ReadBytesAsync), then decodes each
         // element from its big-endian slice into an element-typed CLR array. The scalar path
-        // (count null / <= 1) is left byte-for-byte unchanged below.
-        if (tag.ArrayCount is > 1)
+        // (count null) is left byte-for-byte unchanged below. A count of 1 IS a valid 1-element
+        // array (the foundation materialises a [1] OPC UA array node when isArray:true).
+        if (tag.ArrayCount is >= 1)
             return await ReadArrayAsync(plc, tag, addr, ct).ConfigureAwait(false);
 
         // S7.Net's string-based ReadAsync returns object where the boxed .NET type depends on
@@ -793,10 +794,10 @@ public sealed class S7Driver
         var folder = builder.Folder("S7", "S7");
         foreach (var t in _options.Tags)
         {
-            // A tag carrying an array count (> 1) surfaces as a 1-D OPC UA array node; a missing
-            // count or a count of 1 stays scalar (count == 1 array adds no information over a
-            // scalar and would force every read down the slower block path).
-            var isArray = t.ArrayCount is > 1;
+            // A tag carrying a non-null array count (>= 1) surfaces as a 1-D OPC UA array node.
+            // A null count stays scalar. A count of 1 IS a valid 1-element array: the foundation
+            // materialises a [1] OPC UA array node when isArray:true, so the driver must agree.
+            var isArray = t.ArrayCount is >= 1;
             folder.Variable(t.Name, t.Name, new DriverAttributeInfo(
                 FullName: t.Name,
                 DriverDataType: MapDataType(t.DataType),