PR 6.2: notebooks 03 (leakage + time windows) + 04 (lift / calibration / value / cohort)#74

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feat/notebooks-leakage-and-value-ranking

May 7, 2026

Commits on May 7, 2026

PR 6.2: notebooks 03 (leakage + time windows) + 04 (lift / calibration / value / cohort) + bootstrap robustness harness

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PR 6.2 self-review pass: fix narrative contradictions, strengthen gates, kill dead code

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PR 6.2 Copilot review pass: fold all four real findings back in

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