feat(core): add anime.js runtime adapter (#569)

## Summary
- Adds a `RuntimeDeterministicAdapter` for anime.js v4+ alongside existing Lottie, Three.js, WAAPI, and CSS adapters
- Enables frame-accurate rendering of anime.js animations — the adapter converts seek time (seconds) to milliseconds and calls `.seek(timeMs)` on registered instances
- Auto-discovers running instances via `anime.running`; compositions can also register manually via `window.__hfAnime`

## Usage in compositions

```html
<script src="https://cdn.jsdelivr.net/npm/animejs@4.0.2/lib/anime.iife.min.js"></script>
<script>
  const anim = anime({
    targets: '.box',
    translateX: 250,
    rotate: '1turn',
    duration: 2000,
    autoplay: false,
  });
  window.__hfAnime = window.__hfAnime || [];
  window.__hfAnime.push(anim);
</script>
```

## Files changed
- `packages/core/src/runtime/adapters/animejs.ts` — adapter implementation
- `packages/core/src/runtime/adapters/animejs.test.ts` — 15 unit tests
- `packages/core/src/runtime/init.ts` — register adapter in runtime init
- `packages/core/src/runtime/window.d.ts` — add `anime` and `__hfAnime` globals

## Test plan
- [x] All 15 unit tests pass (`bun run --cwd packages/core test -- --run adapters/animejs`)
- [x] Build passes (`bun run build`)
- [x] Pre-commit hooks pass (lint, format, typecheck, commitlint)
- [x] Manual test: render a composition using anime.js animations

packages/producer/tests/animejs-adapter/meta.json

@@ -0,0 +1,13 @@
+{
+  "name": "animejs-adapter",
+  "description": "Regression guard for the anime.js v4 runtime adapter. Verifies that anime.createTimeline(), stagger(), and seek() render deterministically via the __hfAnime adapter bridge.",
+  "tags": ["regression", "adapter"],
+  "minPsnr": 30,
+  "maxFrameFailures": 0,
+  "minAudioCorrelation": 0,
+  "maxAudioLagWindows": 1,
+  "renderConfig": {
+    "fps": 30,
+    "workers": 1
+  }
+}