<DeckMatrix> iteration — vacuous-Ready bug fixed, rollups merged into one pill, variant filter chips, OPEN button retired, plan revised to keep per-variant TOC alive
Three in-browser review passes on chroma's index produced four DeckMatrix refinements and one plan revision. The matrix the morning shipped was structurally right but visually noisy and wrong on two specific decisions — the per-surface rollup rendered as five separate count pills wrapping onto two lines per surface (ten pills per column for a 4-variant deck); the column-level OPEN link buried the scroll-vs-play surface distinction into one button that dumped readers into 'the deck' without saying which surface; and a `getStaticPaths`-free variant with zero slots was vacuously satisfying the Ready badge's 'no blockers found' check. Fixing those produced one larger consequence: the per-variant `/toc/[deck]/[variant]/` route, originally slated for deprecation-to-redirect in Phase 6 of the redesign plan, gets to stay alive — the deck-level matrix and the per-variant TOC serve different workflow needs (cross-variant comparison vs. land-in-one-variant), and the variant-name in each column header now links to the latter as the variant's landing surface.