A verification-detail-shaped preview of the fields a level can return,
built from its workflow DEFINITION instead of a completed session.

A branching questionnaire only shows one branch per real verification;
the definition carries every branch, so integrations can map columns for
all of them before anyone verifies. The level's check fields (identity
document data, check statuses) are included too, trimmed to this client's
granted visibility exactly like the real detail response. Values are
samples, not data - no session is read or created.