🧪 Add unit tests for Circle.Intersects(Line)

[johnstrand]

🎯 What: Missing unit tests for Circle.Intersects(Line) and Circle.Intersects(Vector2, Vector2) overloads.

📊 Coverage: Added tests covering line passing through circle, line segment inside circle, tangent line, non-intersecting line, short line pointing at circle, and start/end Vector2 overload.

✨ Result: Circle intersection test coverage expanded, preventing regressions in geometry calculations.

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PR created automatically by Jules for task 13966049806553614393 started by @johnstrand

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