The value of traceability is measured by one thing only: how far it narrows the recall scope when a defect appears. What matters is not the precision of cell-level data but whether the mapping survives each process boundary — and when one mapping link breaks, the recall scope does not grow by addition but is multiplied by that level's capacity. Under the assumed site configuration below, a missing module-to-rack-slot mapping widens the suspect population from 24 cells to 480, a factor of 20. Every figure below is an assumed value for illustration and must be recalculated against an actual site configuration. 1. The Conclusion First — The Cost of a…