Add motion and animations

Add motion to UI components honoring budget and intensity

When you need motion that passes the Decision Ladder and respects motion budgets (100-400ms per element class).

• · target UI element
• · MOTION_INTENSITY setting (1-10+)
• · optional: stack reference if opted in

• · CSS transitions / @keyframes / animation-timeline edits

• · ui-craft skill (parent)
• · references/motion.md
• · references/stack.md

• · ui-craft skill loaded and discovery completed
• · target component identified

• · ease-in applied to UI (anti-pattern)
• · animation duration exceeds budget
• · libraries mixed on same property

• · Motion budget table provided
• · Anti-slop rules (no ease-in on UI)
• · Knob-gating by MOTION_INTENSITY documented