Circle.ToPoints() always generated CCW points regardless of the Rotation
property, so reversing a circle contour in the CAD converter had no effect.
Now negates the step angle when Rotation is CW, matching Arc.ToPoints behavior.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Move 43 root-level test files into feature-specific subdirectories
mirroring the main codebase structure: Geometry, Fill, BestFit, CutOffs,
CuttingStrategy, Engine, IO. Update namespaces to match folder paths.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>