Externalize vigilance requirements to tools or protocols

Why This Is a Principle

This principle derives from Directed Attention as Depletable Resource (attention as finite, depletable resource) and Human memory under stress and cognitive load is unreliable (memory under stress/load is unreliable). The lesson demonstrates through vigilance decrement research that sustained attention fails predictably. The principle prescribes externalizing detection responsibility to systems that don't degrade. This is broader than 'use checklists' (a rule) and narrower than 'attention is limited' (an axiom).