plugins は何をしますか？
MUST read before writing ANY animation or transition — CSS, JS, SwiftUI/UIKit, Remotion/video, Framer Motion, GSAP, canvas, or hand-driven. Covers the motion guidance for combining animations (stagger, never synchronize), spring feel vs timing, additive animation, velocity handoff from gesture to animation, and interruptibility. Triggers on: 'animate', 'animation', 'transition', 'fade in', 'slide in', 'easing', 'spring', 'duration', 'keyframes', 'motion design', 'micro-interaction', 'make it fee