Goal: validate intent with a tiny paid action and ensure end to end wiring is solid (landing page → Stripe → success).
This is a lightweight "raise your hand" purchase. If you buy, you should expect a short follow up asking what you want Lightcap to build next.
This is a dedicated Payment Link for X002.
Routing: xNNN.lightcap.app rewrites / to /experiments/xNNN/index.html via Pages middleware.