E.13:9 - Rationale

FPF needs measurement, evaluation, assurance, and release checks, but those checks remain instruments. They are not the value by themselves. E.13 keeps the visible instrument attached to the intended value and asks whether the value survives optimization pressure.

The pattern is intentionally small. Goodhart-style failure is not repaired by another large audit apparatus. It is repaired by restoring the relation among value, proxy, use position, protected qualities, and a small slice where the value is visible.