retrain external(dktc/kmhas/apeach) v6 r1 blind-v8 approved

retrain hardcases v4 r1 blind-v6 approved (risk_recall 1.0)

cleanup: remove training state and stale evaluation files

retrain hardcases r1 blind-v2 approved

retrain: leak-free binary + AI-Hub in-domain, PAN excluded; adult tau=0.66 recall=0.851 specificity=0.848

retrain: binary(정상/주의) + PAN12 predator 190건, holdout 주의R=0.859/정상P=0.752 (τ=0.5)

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Upload folder using huggingface_hub

initial commit