Demo host — example integrating platform

This page is NOT part of the embed. It mimics an operator that holds the real wallet and drives the game over postMessage.
Platform wallet (real balance)
—
Embed snippet:
<iframe src="/embed?balance=1000&host=ORIGIN"></iframe>

embed→host: slot:ready, slot:result{bet,win,delta,balance}, slot:balance
host→embed: slot:setBalance{balance}, slot:getBalance
See INTEGRATION.md for the full protocol.
Game:  — runs inside the iframe (the embeddable widget); balance is whatever this host sets.