🧪 [Add tests for Vec3::dot]

[google-labs-jules]

🎯 What: The testing gap addressed is the missing tests for Vec3::dot method which calculates the dot product of two 3D vectors.
📊 Coverage: The scenarios now tested include orthogonal vectors (dot product = 0), parallel vectors (dot product = length1 * length2), anti-parallel vectors, vector dotted with itself (length squared), zero vector dotted with a non-zero vector, and vectors with mixed positive and negative components.
✨ Result: The test coverage for fundamental math operations is improved, increasing confidence in the mathematical correctness of Vec3::dot and safeguarding against future regressions.

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PR created automatically by Jules for task 1504556955280680773 started by @EricBorges2019

[google-labs-jules]

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