Safety is a set of permissions, held before the work starts.
Who may enter, who may isolate, who may work alone, what was assessed, and what proves it. Residention holds permits, method statements, competency and lone-working sessions against the building and the person, not in a folder somebody remembers.
Most safety systems record what happened. The harder question is what was allowed before it happened: was this contractor inducted for this site, was the permit still valid at the hour the work ran, did anyone know the technician was alone in a plant room at nine in the evening.
Residention answers those questions from records that existed at the time. A permit is bound to a person, a place and a window. A competency claim is separated from the certificate that evidences it. A lone-working session has a check-in due and an escalation route if it is missed.