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Classifier v3: removed the 85% leakage feature, got 0.86 LOCO F1
The v2 classifier hit 99.8% F1 but country_risk_tier (a hardcoded label leakage) carried 85% of that signal. v3 drops it. Honest leave-country-out F1: 0.86 (Iran AUC 0.95).
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