Geometry Primitives

The reusable package is built on a small set of geometry and utility types.

`Vec2`

Vec2 is the package's 2D vector type. It provides:

length through Norm()
scalar products through Dot()
oriented area / turning information through Cross()
arithmetic operators for simple vector math

`CubicBezier`

CubicBezier evaluates and differentiates cubic segments in normalized local space. It is used for:

shape evaluation and derivative estimation
curvature estimation
subdivision into left and right halves

`BezierPath`

BezierPath collects commands in a transport-friendly form:

MoveTo
LineTo
CurveTo
ClosePath
Mark

The same structure is used for SVG serialization and approximate hit testing.

`MathUtils` and `Polynomial`

MathUtils centralizes low-level numerical helpers such as:

angle normalization with Mod2Pi
Hermite quintic coefficient generation
hypotenuse calculation
tridiagonal solving for parity with the original research code

Polynomial is a small coefficient-based helper used in the curvature-adjusted rendering path.