ga2 0.7.0

Common types for 2D geometric algebra
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# ga2

2D geometric algebra types for Rust.

## Types

- `Vector<T>` - 2D vector with `x`, `y` components
- `Bivector<T>` - 2D bivector with `xy` component
- `Rotor<T>` - 2D rotor with `scalar`, `xy` components (rotation operator)
- `Point<T>` - 2D affine point with `x`, `y` components

## Features

- Full arithmetic on all types (add, sub, mul, div, neg)
- Geometric product: `Vector * Vector -> Rotor`
- Wedge product: `Vector::wedge(other) -> Bivector`
- Rotor rotation via sandwich product
- `Rotor` implements `vector_space::Transform<Vector<T>>`
- `Point - Point -> Vector` (AffineSpace)
- `Display`/`FromStr` for all types
- `VectorSpace`, `DotProduct`, `InnerSpace` trait integration
- `Basis<0>`, `Basis<1>` for component access
- Optional serialization via `data-stream` feature
- Optional parsing via `parsable` feature

## Example

```rust
use ga2::{Vector, Point};

let a = Point::new(1.0, 2.0);
let b = Point::new(4.0, 6.0);
let displacement: Vector<f32> = b - a;

let rotor = Vector::x(1.0) * Vector::y(1.0);
let rotated = rotor.rotate(Vector::new(1.0, 0.0));
```

## AI-assisted development

This crate is designed for use with AI coding assistants. Consistent trait implementations across all types, no implicit behavior, `Display`/`FromStr` on all public types, and standard `VectorSpace`/`InnerSpace` trait integration make it straightforward for AI to work with.