I turned it from a one-off script into a real harness I run with one command against the whole stack. It attacks the backend, replays out-of-order Stripe events to prove a cancelled plan can't come back, and it screenshots the site and fails if the page renders as a flat white frame. That last one is a real bug I hit: the old checks passed because there were no console errors, but the entire hero was painting white on certain GPUs.