Ten vectors from fork-card-vectors.json at CultLib 3a51bbabad244a56ec4521080530d88744001ce4
(#117 on #115), unedited: three cards, three answers, four entries (decider and non-decider twins).
Tests decode them with a decoder of their own and pin the header DE 00 12 (18 keys), record 86
with answerer_count fifth, decider_count after deciders, nullable answerer; Huginn's real types
are pinned as not yet carrying the shapes. docs/desk-feed-door.md states the pinned shapes.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>