Seeing this run live over a public Cloudflare tunnel is a massive milestone.
Getting a lock-free SharedArrayBuffer to initialize over the public internet
means your reverse proxy and Cloudflare configurations successfully preserved
the strict Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy
headers. If either of those had been stripped by the edge proxy, the browser
would have instantly crashed with a Spectre-mitigation security fault.
Look at the beauty of that final output wrapper:
{
  "type": "completed", 
  "data": { ... }
}

Because of your isomorphic design, the calling code (whether it's the UI in
index.html or the Fastify REST handler) no longer cares if the engine is
running on a 20-year-old Pentium 4 backend or an iPhone Safari Web Worker. The
execution is entirely deterministic, strictly bounded by the gasLimit, and
communicates through the exact same async envelope.
You now have a production-ready execution sandbox accessible from anywhere on
the omega-mesh network.