Add theoretical_data.jsonl (1368 pre-mined triplets); large generalization gain, 161_pass retention regression noted in card

Anonymized wrong-interpretation negatives + hybrid dense/BM25 mining; add base-model benchmark comparison

Retrain on expanded expert_pass corpus (452 pairs, 299 passages, +100 rows)

Retrain on expanded expert-validated expert_pass corpus (352 pairs, 199 passages)

Contrastive continue-train on expert_pass (mined hard negatives)

initial commit