Gap says why the fold did not happen or did not complete, when that is the case. An empty surface and an unreachable warehouse are different facts and a model must not report them as the same one.
Refused is how many buckets of this organisation's own surface the fold could not fold, because a subject on them is longer than this plane's own field bound. It is history the model does not have, said out loud.
Replayed is how many of this organisation's own recorded observations rebuilt its sliding aggregates when the model became resident. It is what says a rollout was a rebuild rather than a blindness: the aggregates are a projection of a durable record, so a restart costs a replay and not a control.
Rolled is how many windows of this organisation's own source planes — product events, captured failures, metered inference — were rolled up into its feature surface before that fold. Zero with no gap means the surface was already current, which is a different fact from the rollup never running.
