Vendor CultLib's revision and retraction answer vectors (string answerer; no vector nulls them).
The doc and test now say two variants are pinned nulled by bytes (Counted, Refused) and all four
by ruling desk-reader-counts-shape. The sha test requires the fixture README and the doc to name
CULTLIB_SHA verbatim. Doc notes Bifrost heimdall/desk-card-repin (f977a43) re-pin and
DeskDocuments.cs JsonRequired answerer_count.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>