confirm() prints 'declined: <reason>' and exits 3 whenever the answer is no or nobody can answer (not a
terminal without --yes, serve without the owner's dialog), so no command reports success after declining.
flow run stops at such a step with 'step N declined: <reason>' (status declined), never ok. flow run
--apply --yes passes --yes to write steps only; --yes without --apply is refused. Pitfall 24.
