Remove birthweight dataset references and fix 4 test failures#3

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Copilot wants to merge 2 commits intomasterfrom

copilot/remove-birthweight-references

Commits on Feb 25, 2026

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Copilot
committed
Fix 4 test failures: remove birthweight test, fix convergence data function, fix boundary detection, fix sex-stratified check

Copilot
and
jackmurphy2351
committed