New in v3. The two selected cards now hold a fixed
stage at the top of the screen, so they never scroll away while you read. The passages are split into
four labeled layers by how much authority each carries: direct combination evidence, inferred relationship, the source count, then looser reading examples. Built on the same verbatim corpus as the live version,
the current /chiron-combinations page. Companion single-card reference,
the cheatsheet.