ENH: Add exact Cramér-von Mises two-sample p-value gufunc#118

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fbourgey wants to merge 10 commits into

fbourgey:cramer_von_mises_gufunc

Commits on May 28, 2026

ENH: Add device-safe gcd and lcm functions, and implement exact p-value calculation for Cramér-von Mises two-sample test
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TST: Add unit tests for exact p-value in Cramér-von Mises two-sample test
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ENH: Include <cuda/std/numeric> for numeric functions and ensure proper usage of gcd and lcm
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REF: gcd and lcm implementations; use cuda lcm instead
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REF/TST: Replace custom lcm implementation with std::lcm in pval_cvm_2samp_exact test
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ENH: use std::max
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ENH: Refactor Cramér-von Mises two-sample test to separate frequency table generation
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TST: update test
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ENH: Add helper functions for Cramér-von Mises frequency table generation and p-value computation
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ENH: Add tests for take_from_discrete_sf and edge cases in pval_cvm_2samp_exact and update test values
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