vanderpoel_pairing

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Emily Noyes Vanderpoel's documented 'good' dyad/triad hue groupings (Color Problems, 1902, Plate XXXVI 'Good Dyads or Pairs' and Plate XXXVII 'Good Triads'), served from the build artefacts vanderpoel_dyads.json and vanderpoel_triads.json. Snaps an input hex to the nearest of Vanderpoel's eleven real hue-family labels, resolves that hex against the archive, and returns every documented dyad or triad the label belongs to -- each OTHER member carrying its own nearest real archive match (CIEDE2000), with hex_collision disclosed when the match is tied. Unlike hay_contrast, this carries NO proportional ratio -- only Vanderpoel's own categorical 'good' editorial judgement, printed verbatim on the plates. Returns groupings: null for a near-neutral input, where hue is not meaningfully defined, or when the nearest hue-family label is a member of no dyad or triad -- silence is the honest answer, not a forced match. Member names come from a transcriber's digitisation_alt_text (an accessibility description of the plate image), not verified printed captions; every response states this caveat explicitly (member_source_caveat), not just a code comment. The hue positions used to snap an input to a label are a modern matching convention, not a number Vanderpoel printed -- disclosed per response as label_placement_basis.