⚡ Optimize AABB intersection methods by eliminating allocations and redundant math

[johnstrand]

💡 What: Optimized AABB.Intersects overloads for Polygon2D, Circle, Vector2 center/radius, and Vector2 start/end.

🎯 Why: Intersects(Polygon2D) was redundantly recalculating polygon bounds on the fly despite polygon.BoundingBox already being pre-computed on construction. Intersects(Vector2 center, float radius) was instantiating new Circle() on the heap on every invocation. Intersects(Vector2 start, Vector2 end) was constructing new Line(), which performed unnecessary calculations for line length, midpoint, and normal vectors.

📊 Measured Improvement:

• IntersectsInside: 18.49 ns → 7.21 ns (61% faster)
• IntersectsIntersecting: 20.01 ns → 8.77 ns (56% faster)
• IntersectsContainsAABB: 68.70 ns → 61.45 ns (10.5% faster)
• Eliminated heap allocations for circle and line segment intersection overloads.

✨ Result: All 413 unit tests pass cleanly.

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PR created automatically by Jules for task 10479672689742488225 started by @johnstrand

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