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 Preprocessing-Leakage Gate (preprocess-imaging)
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  transforms=4  units=5  patients=5  partitions={'test': 2, 'train': 2, 'val': 1}  seed=7
| Check | Severity | Detail |
|---|---|---|
| (none) | — | preprocessing manifest is leakage-safe |

OK: preprocessing manifest is leakage-safe.
