/toc/[deckSlug]/[variantSlug]/ — bird's-eye-view audit dashboard with rank pills + scaffold buttons

Static table-of-contents route emitted for every (deck, variant) pair in the consumer's `DECKS` registry. Renders one row per slot from `SLOTS[variantSlug]`, each row showing the slot number, title, five rank pills (mirroring SlideRankPill's enum), a scaffold button that POSTs to /api/slide-decompose, and — when the per-slide file exists — a `[view →]` link to `/play/{deck}/{variant}/{slot}/`. The TOC is the read-only-on-deploy / read-write-in-dev audit surface; it complements (does not replace) the in-place SlideRankPill on scroll-deck routes.