Use when launching, stopping, or resuming an expensive multi-agent research run (deep-research or a Workflow fan-out) — how to checkpoint at launch, stop before a usage meter runs into paid overage, and resume from the journal cache byte-identically instead of re-paying. Invoke before firing a long Workflow, when the maintainer names a usage threshold or reports a meter running hot, and before diagnosing an empty or failed run as lost work.