null while the run is still processing.
What actually ran, as opposed to the pinned ENGINE_VERSION we asked for.
The handle a caller needs to delete the upload once the run settles.
true means the boxes came off the PDF's own widgets; false means they were detected on a
flat page. null when the vendor sent no config — consumers must fail closed and adjust
nothing unless the run positively says the boxes were detected flat.
Populated only once status is PROCESSED.
PROPOSALS ONLY: these may be normalized and shown for review, but nothing may store or apply one without an explicit human accept. The generator measurably hallucinates.