Ensures a daemon is running for this project, spawning one if there isn't.

The daemon holds a browser and a warm esbuild context between runs, which is worth roughly 800 ms per run — so it pays for itself the second time a long-lived process runs the suite.

Idempotent: with one already up, this is a liveness probe and nothing is spawned.

import { start } from './daemon.ts';

// Defined, not invoked: may spawn a real background process.
async function warmUp() {
  return await start(); // true once a daemon is reachable
}