feat(assets): publish reusable area packages

examples/three-asset-package.js

@@ -0,0 +1,17 @@
+"use strict";
+
+const { resolveAsset, placement } = require("./asset-package-resolver");
+
+async function loadPackage(loader, manifestUrl, assetId = "main", handoffEnuPlacement) {
+  const manifest = await fetch(manifestUrl).then((response) => {
+    if (!response.ok) throw new Error(`Could not load manifest: ${response.status}`);
+    return response.json();
+  });
+  const scene = await loader.loadAsync(resolveAsset(manifestUrl, manifest, assetId));
+  // Three.js does not georeference local ENU itself; the embedding host owns it.
+  const enuPlacement = placement(manifest);
+  if (handoffEnuPlacement) handoffEnuPlacement(enuPlacement, scene.scene);
+  return { manifest, scene: scene.scene, placement: enuPlacement };
+}
+
+module.exports = { loadPackage };