# `[2026-09-17]` The beat-contamination leak IS present in Hemingway — 70 of 7,094 train beats (0.96%), 0 of 200 val.

⭐ **The beat-contamination leak IS present in Hemingway — 70 of 7,094 train beats (0.96%), 0 of 200 val.** `scripts/r49-corpus/audit_pairs_sourcenames.py` closes the blind spot `leak_gate.py` has by construction (it reads the corpus and the renamed copies, never the generated beats). Cross-validated on real data: the fixed Brontë pairs return 0 of 3,858 and `pairs-full.CONTAMINATED` returns 15 of 792 = 1.89% with the recorded names. `--filter-out` yields a verified-clean 7,024-pair set in one command; the retrain is the operator's call. **The val split being clean is why the gate could run at all.**