Personal skill distilling the MengTo motion pack invariants (LRN-141):
gates first (reduced motion renders final states, content visible without
JS, compositor-only, offscreen pause), one smooth-scroll engine with the
Lenis/ScrollTrigger sync, Astro ClientRouter lifecycle, numbered recipes
(reveal, scrub, sticky stack, video and image scrub, TreeWalker split,
progressive blur, marquee, WebGL budgets), upstream pitfalls, checklist.
Routed into the Build UI chain of CLAUDE.global.md and lib/design-gate.md.
bastien
ba14b5ea03