Builds premium, scroll-driven landing pages where scroll is the timeline rather than a way to reach the next section. Ships eight mutually exclusive page grammars (filmic one-shot, chaptered editorial, live surface, continuous world, typographic poster, gallery, split stage, rhythmic cutlist), each forbidding what the others require, so two builds cannot quietly converge. Every build must invent one signature interaction that exists on that page alone, and must differ from every page already made on at least four of six dimensions — grammar, nav, hero, act shape, close, signature move. Enforces a typography floor, a spacing scale, six colour roles with one accent, and five depth tools. Then verifies its own work: a headless browser walks the finished page at every scroll position and reports dead scroll, cues that never reach full opacity, per-line contrast measured on the composited page at the brightest frame that passes under it, and clips that silently never decoded.