Barcode / QR Resolver

Scanner input is resolved against canonical product identity. This diagnostic must not create or change orders, payments, or inventory movements.

1. Load the scan acceptance baseline.
2. Resolve the prefilled known barcode and confirm one canonical product variant.
3. Resolve the same known barcode again and confirm the same variant; repeated stable becomes true.
4. Use unknown sample and resolve it; confirm result is unresolved.
5. Confirm commerce invariant unchanged remains true throughout.