Refactor code formatting and improve consistency across various test files

- Removed unnecessary blank lines in multiple test files to enhance readability.
- Ensured consistent spacing and formatting in the `Trima`, `Usf`, `Vidya`, `Wma`, and `Atr` test classes.
- Updated comments for clarity and consistency in the `Atr` and `Adl` classes.
- Adjusted project files for better structure and maintainability.

lib/statistics/linreg/LinReg.Validation.Tests.cs

@@ -29,7 +29,7 @@ public sealed class LinRegValidationTests : IDisposable
     {
         var period = 14;
         var skender = _data.SkenderQuotes.GetSlope(period).ToList();
-        
+
         var linreg = new LinReg(period);
         var slopeSeries = new TSeries();
         foreach (var item in _data.Data)
@@ -47,7 +47,7 @@ public sealed class LinRegValidationTests : IDisposable
     {
         var period = 14;
         var skender = _data.SkenderQuotes.GetSlope(period).ToList();
-        
+
         var linreg = new LinReg(period);
         var r2Series = new TSeries();
         foreach (var item in _data.Data)

lib/statistics/linreg/LinReg.cs

@@ -166,7 +166,7 @@ public sealed class LinReg : AbstractBase
         _state.SumY = _buffer.Sum;
         _state.SumXY = 0;
         var span = _buffer.GetSpan();
-        
+
         // Vectorized SumY2
         _state.SumY2 = span.DotProduct(span);
 
@@ -248,7 +248,7 @@ public sealed class LinReg : AbstractBase
                 // R2 = (n * sum_xy - sum_x * sum_y)^2 / ( (n * sum_x2 - sum_x^2) * (n * sum_y2 - sum_y^2) )
                 double numerator = Math.FusedMultiplyAdd(n, _state.SumXY, -sx * _state.SumY);
                 double term2 = Math.FusedMultiplyAdd(n, _state.SumY2, -_state.SumY * _state.SumY);
-                
+
                 RSquared = Math.Abs(term2) < MinDenominator
                     ? 1.0 // All y are same
                     : numerator * numerator / (denom * term2);