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feat: Phase G G6 — calibration-overfit warning for small cohorts - #770
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Adds check_cohort_overfit_risk() and run_overfit_check() to flag when a calibration cohort is too small relative to model parameters. Warns at three severity levels (caution/warning/critical). CLI subcommand calibration-overfit-check. 10+ tests. Prevents false learning from under-powered cohorts.