A CSV benchmark with two zero scores and a useful diagnostic

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This is a submission for the Kaggle Benchmarking Challenge. Inventory reconciliation sounds straightforward: match a count to an exported product row and replace its new quantity. The difficult part is preserving everything else and recognizing when an update should be blocked. CSV Contract Integrity tests this with synthetic, offline inputs. Each model receives an export CSV, a count CSV, an explicit column mapping, and a reconciliation contract.

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