Character Benchmark

# Benchmark task: a procedural anime character in Three.js

Build a **single, self-contained HTML file** that renders a **manga / anime-style humanoid character** that is fully **procedural** (constructed in code from primitives and parametric geometry — NO external model files, textures, or asset URLs), **rigged**, and **animated**.

## Hard requirements (this file is auto-loaded and screenshotted by a harness — follow exactly)

1. **One HTML file. No build step.** Load Three.js (r160+) and `OrbitControls` via an ES-module `importmap` from a CDN (unpkg / jsdelivr / esm.sh). No bundler, no npm, no local files.
2. **Self-contained character.** Construct the entire character procedurally from Three.js geometry (boxes, spheres, capsules, lathes, extrudes, custom `BufferGeometry`, …). Do **not** load `.glb/.gltf/.fbx/.vrm` or any image texture from a URL. Define all materials in code.
3. **Anime / manga style & proportions:** stylized — large head ratio (~1:5 to 1:6), large eyes, slim limbs, clean readable silhouette. Cel / flat shading is welcome. It must read as an anime character, not a generic grey mannequin.
4. **A real rig.** The character must be genuinely articulated: either a `SkinnedMesh` + `THREE.Skeleton` / `Bone` hierarchy, **or** a clean parented `Group` / `Object3D` joint hierarchy (hips → spine → head; shoulders → arms; hips → legs). Animations must rotate these joints — not merely translate the whole mesh.
5. **Five animations**, each a believable clip:
   - `idle` — subtle breathing / weight-shift sway, looping
   - `walk` — walk cycle in place, arms and legs counter-swinging, looping
   - `jump` — crouch → launch → airborne → land, looping
   - `wave` — standing and waving one arm hello, looping
   - `sit` — lower into a seated pose and hold it (calm idle while seated)
6. **Scene:** a `PerspectiveCamera`, `OrbitControls`, a ground / floor plane, sensible lighting (a key light + ambient or hemisphere), and a neutral background. The character is centered and fully in frame at load.
7. **Animation-switching UI:** on-screen buttons for the five animations.
8. **Harness control hook — REQUIRED.** Expose this on `window` exactly:
   ```js
   window.__bench = {
     animations: ['idle', 'walk', 'jump', 'wave', 'sit'],
     setAnim(name) { /* switch to that animation immediately */ },
   };
   ```
   `setAnim` must accept exactly those five names. The default animation at load is `idle`.
9. **Zero console errors.** It must run cleanly when the file is opened directly over `file://`.

## Output format

Return **exactly one** ```html fenced code block containing the complete file, and nothing else — no explanation before or after.