design-eng

Decides whether UI motion should exist, then picks easing, duration, origin, and gesture behavior. Covers frequency limits, springs, popover origin, tooltips, clip-path reveals, drag dismissal, and reduced motion. Activates when adding a transition, popover, drawer, toast, or drag gesture, or when the user says 'design engineering', 'should this animate', 'easing', 'spring', 'popover origin', or 'emil'. Do not use for concentric radius, surface shadows, the 0.96 press scale, or icon cross-fades - that is vd:better-ui. Do not use for design-system choice, page implementation, or accessibility audits - that is vd:uiuxdesign.