feat(core): add Motion (motion.dev) runtime adapter

[miguel-heygen]

Summary

• Adds a RuntimeDeterministicAdapter for Motion v12+ (motion.dev) — the framework-agnostic library from the creators of Framer Motion
• Seeks via the .time setter (seconds) on animation instances registered via window.__hfMotion
• Runs before the WAAPI adapter in the adapter chain so Motion owns its animations while the generic WAAPI adapter catches the rest

Usage in compositions

<script src="https://cdn.jsdelivr.net/npm/motion@12/dist/motion.min.js"></script>
<script>
  const { animate, stagger, spring } = Motion;
  const anim = animate('.box', { x: 250, rotate: 360 }, {
    duration: 2,
    ease: spring(),
  });
  window.__hfMotion = window.__hfMotion || [];
  window.__hfMotion.push(anim);
</script>

Files changed

• packages/core/src/runtime/adapters/motion.ts — adapter implementation
• packages/core/src/runtime/adapters/motion.test.ts — 11 unit tests
• packages/core/src/runtime/init.ts — register adapter before WAAPI
• packages/core/src/runtime/window.d.ts — add Motion and __hfMotion globals

Test plan

• All 11 unit tests pass
• All 84 adapter tests pass (full suite: gsap, css, waapi, lottie, three, animejs, motion)
• Build passes
• Pre-commit hooks pass (lint, format, typecheck, commitlint)