Sort Scenarios By Test Layer

Place each scenario at the layer that should own the first proof. Unit test Integration test End-to-end test Exploratory review Discount function returns no discount for expired coupon Payment adapter sends application_fee_amount in cents Guest can complete checkout from cart to receipt New checkout layout feels understandable on mobile Password validator rejects blank passwords Repository query maps database rows into order objects Critical signup path works after auth middleware change Unexpected support workflow might reveal missing states

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