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 Split-Leakage Gate (model-validation)
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  rows=13  subjects=12  partitions={'test': 4, 'train': 6, 'val': 3}  seed=42
| Check | Severity | Detail |
|---|---|---|
| (none) | — | patient-disjoint split with a recorded seed |

OK: patient-disjoint split with a recorded seed.
