Resume Campaign

Un-pause, voiding any queued draft whose playbook, policy or pricing has moved since it was written (Stage E).

⛔THIS ROUTE CALLS campaign_relaunch.resume, NOT service.resume_ campaign. The service function is the plain status flip and is still the right primitive; what a human clicking Resume means is "start sending again", and starting to send again with ten drafts written under superseded rules at the front of the queue is not what they asked for. The count of what was voided comes back in the response so the click has a receipt rather than a silence.