Theme-authoring page — the motion dimension: the closed vocabulary, the per-character character contract (what a theme must preserve vs is free to vary), the physics tokens, and how to choreograph across a rune's named parts (sync vs offset) — including the author-intent / theme-choreography / JS-when / CSS-how principle.
Author reference — reveal="none|fade|slide|scale|blur" and stagger, with the opt-in default and the reduced-motion behaviour; a feature/bento stagger example.
Showcase — a section that exercises reveal + stagger (a feature grid cascading in), demonstrating the global coverage and the reduced-motion/no-JS complete-render fallback.
Acceptance Criteria
A theme-authoring motion-dimension page documents the vocabulary, the character contract, the physics tokens, and choreography over named parts.
An author-facing reveal/stagger reference documents the values, the opt-in default, and reduced-motion behaviour, with a feature-stagger example.
A working showcase shows a cascading feature/bento; reduced-motion and no-JS render the complete static section; contracts green and CSS coverage passes.
Dependencies
WORK-431, WORK-432, WORK-433 — documents and demonstrates the whole dimension.