ConstReadonlyLIVE: "live"The annotation's live coordinates rows, used when the run has no snapshot.
ReadonlySNAPSHOT: "snapshot"form_answers.coordinates_snapshot — the geometry frozen when the answer was
produced. Preferred: it is what the filled PDF was drawn against, so overlays line up
even if the template was re-annotated afterwards.
Which set of boxes resolveAnswerCoordinates returned.