Sourcing cases that matter

Coverage lab: 34 failing rows from the last module reduce to 30 distinct cases and fill 18 of 21 scenario × mechanism cells — but 11 of those cells hold exactly one case, so 85.7% occupancy is not coverage. Spending a budget of 18 by failure count fills 7 cells and leaves 11 untouched, while one case per cell fills all 18. A reply-only grader sees 13 cells and reports 5 occupied cells as empty, because 6 of 34 failures need the ledger or the store.

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