Greyson LaLonde 9492788e10 tests: speed up GitHub Actions with parallelization ...

- Add pytest-xdist and pytest-split to dev dependencies
- Split tests into 4 parallel groups per Python version
- Enable CPU-level parallelization with -n auto
- Add fail-fast strategy and maxfail=3
- Improve caching for Python packages

2025-07-02 20:03:41 -04:00

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