The sequence
Two follow-ups a week apart, then a final note stating the project is being marked dormant.
Dormant means
Production stops. Files and approvals are retained. The slot returns to the calendar.
Invoicing
Work completed up to the pause is invoiced. We do not keep billing for a project nobody is working on.
Coming back
Welcome any time. The remaining work is scheduled into the next available window and the plan is re-confirmed.