Refactor error handling and calculations in TheilU, Wmape, and TukeyBiweight classes; update buffer handling for consistency

- Updated buffer handling in TheilU and Wmape classes to ensure consistency after adding new values.
- Changed the resync interval constant in TukeyBiweight for better clarity.
- Refactored state structures to record structs in Gauss, Hann, Hp, Hpf, Kalman, Loess, Notch, and other filter classes for improved performance and readability.
- Enhanced numerical stability in Mama class calculations using Fused Multiply-Add (FMA) for precision.
- Added comprehensive tests for Atan2 validation to compare .NET's Math.Atan2 with PineScript's implementation, ensuring accuracy across various edge cases.
- Updated NDepend badges to reflect changes in classes, methods, and lines of code.

lib/errors/mase/Mase.cs

@@ -104,18 +104,15 @@ public sealed class Mase : AbstractBase
         {
             _state = _p_state;
 
-            // Incremental update for error buffer: get current newest, compute delta
-            double currentNewestError = _errorBuffer.Count > 0 ? _errorBuffer.Newest : 0.0;
-            double deltaError = absError - currentNewestError;
-            _state.ErrorSum += deltaError;
+            // Bar correction: update buffer and recalculate sums
+            // Note: _p_state was saved BEFORE the Add, but buffer still has the added value
+            // So we update newest and recalculate to ensure consistency
             _errorBuffer.UpdateNewest(absError);
-
-            // Incremental update for scale buffer: get current newest, compute delta
-            double currentNewestScale = _scaleBuffer.Count > 0 ? _scaleBuffer.Newest : 0.0;
-            double deltaScale = naiveDiff - currentNewestScale;
-            _state.ScaleSum += deltaScale;
             _scaleBuffer.UpdateNewest(naiveDiff);
 
+            _state.ErrorSum = _errorBuffer.RecalculateSum();
+            _state.ScaleSum = _scaleBuffer.RecalculateSum();
+
             _state.PrevActual = actualVal;
         }