Increase unit test coverage with JaCoCo report, 845+ tests, math bug fixes, and scenegraph behavior coverage#2638

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Copilot wants to merge 6 commits intomasterfrom

copilot/increase-unit-test-coverage

Commits on Mar 3, 2026

Initial plan
Copilot
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Add unit tests for Vector2f, Vector4f, Matrix3f, and Matrix4f

Copilot
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riccardobl
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Add JaCoCo coverage report and 10 new test files covering math, light, audio, and util classes

Copilot
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riccardobl
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Add comprehensive behavioral JUnit 4 tests for jme3 math library

Copilot
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Copilot
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Add 79 complex behavioral tests, QuaternionTest, and fix near-singular matrix inversion bug

Copilot
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riccardobl
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Add complex scenegraph behavior tests for hierarchy transforms and SceneGraphIterator

Copilot
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riccardobl
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