style patterns

lib/errors/mse/Mse.Tests.cs

@@ -308,4 +308,4 @@ public class MseTests
             Assert.True(double.IsFinite(val), $"Expected finite value but got {val}");
         }
     }
-}
+}

lib/errors/mse/Mse.cs

@@ -61,7 +61,10 @@ public sealed class Mse : BiInputIndicatorBase
     public static void Batch(ReadOnlySpan<double> actual, ReadOnlySpan<double> predicted, Span<double> output, int period)
     {
         ValidateBatchInputs(actual, predicted, output, period);
-        if (actual.Length == 0) return;
+        if (actual.Length == 0)
+        {
+            return;
+        }
 
         // Allocate temporary buffer for squared errors
         const int StackAllocThreshold = 256;