style: rename hasItems to anyItemProcessed in EncodeCore

Agent-Logs-Url: https://github.com/petesramek/polyline-algorithm-csharp/sessions/9ad635cf-efe4-4650-86cc-0083af3375f7

Co-authored-by: petesramek <2333452+petesramek@users.noreply.github.com>

Author: Copilot

src/PolylineAlgorithm/PolylineEncoder.cs

@@ -133,12 +133,12 @@ private TPolyline EncodeCore(IEnumerable<TValue> coordinates, PolylineEncodingOp
         char[]? rented = null;
 
         int position = 0;
-        bool hasItems = false;
+        bool anyItemProcessed = false;
 
         try {
             foreach (TValue item in coordinates) {
                 cancellationToken.ThrowIfCancellationRequested();
-                hasItems = true;
+                anyItemProcessed = true;
                 _formatter.GetValues(item, values);
 
                 for (int j = 0; j < width; j++) {
@@ -159,7 +159,7 @@ private TPolyline EncodeCore(IEnumerable<TValue> coordinates, PolylineEncodingOp
                 }
             }
 
-            if (!hasItems) {
+            if (!anyItemProcessed) {
                 _logger.LogOperationFailedDebug(OperationName);
                 _logger.LogEmptyArgumentWarning(nameof(coordinates));
                 ExceptionGuard.ThrowArgumentCannotBeEmptyEnumerationMessage(nameof(coordinates));