Strip core to render data and render graphs

Move glTF, picking, camera controls, and conventional handles into addons. Keep camera and material mutations in SIMD-aligned shared SOA rows and synchronize material updates directly into GPU buffers.

Amp-Thread-ID: https://ampcode.com/threads/T-01a01380-b478-77d0-84a0-102880a5c5ae
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

examples/cookbook/13-bvh-picking.js

@@ -1,8 +1,6 @@
-import { MeshHandles } from "@yawn/mesh-handles";
-
 /** Query the optional snapshot/BVH worker and receive wrapped instance handles. */
-export function pickNearest(core, origin, direction) {
-  return new MeshHandles(core).pickRay(origin, direction, {
+export function pickNearest(meshHandles, origin, direction) {
+  return meshHandles.pickRay(origin, direction, {
     maxDistance: 10_000,
     maxHits: 1,
   });