The calling project's recent scheduled runs (§27.5), id-free and newest-first.
Queue a one-shot overnight run for later (§27.5). Same hosted-runs grant
as get; the host attests the schedule-time grant proof, so you
never supply it. Resolves an id-free typed union.
Cancel a still-pending scheduled run (§27.5); a non-pending run resolves
{ ok: false, code: 'run-not-cancellable' }.