🐛 Fix staticeval handling

Add delay every 100 fens so that the buffer doesn't get full and evals are lost

src/Lynx/UCIHandler.cs

@@ -560,6 +560,7 @@ private async ValueTask HandleStaticEval(string rawCommand, CancellationToken ca
                 return;
             }
 
+            int lineCounter = 0;
             foreach (var line in await File.ReadAllLinesAsync(fullPath, cancellationToken))
             {
                 var fen = line[..line.IndexOfAny([';', '[', '"'])];
@@ -584,6 +585,13 @@ private async ValueTask HandleStaticEval(string rawCommand, CancellationToken ca
                 }
 
                 await _engineToUci.Writer.WriteAsync($"{line}: {eval}", cancellationToken);
+
+#pragma warning disable S2583 // Conditionally executed code should be reachable
+                if (++lineCounter % 100 == 0)
+                {
+                    Thread.Sleep(50);
+                }
+#pragma warning restore S2583 // Conditionally executed code should be reachable
             }
         }
         catch (Exception e)