Does your board "speak GrowBot"? Enter its base URL and hit Run. See
PROTOCOL.md for the contract.
Tip: open this file from disk (file://) and point it at your board's
LAN address (e.g. http://192.168.1.50) — that avoids browser mixed-content
blocks. A https://…trycloudflare.com tunnel works from anywhere.
Watch the legs while it runs — green checks prove the wire, your eyes prove the motion.