feat: build reproducible dataset editor

apps/dataset-builder/mix-worker.js

@@ -0,0 +1,14 @@
+import { renderSceneMix } from "/packages/acoustics-core/mixdown.js";
+
+self.addEventListener("message", ({ data }) => {
+  try {
+    const assetBuffers = new Map(data.assetBuffers);
+    const result = renderSceneMix(data.scene, assetBuffers);
+    self.postMessage({ ok: true, result }, [result.samples.buffer]);
+  } catch (error) {
+    self.postMessage({
+      ok: false,
+      message: error instanceof Error ? error.message : String(error),
+    });
+  }
+});