Closing and legacy methods

sdk.ready() // your first screen is painted: remove the host's loading overlay
sdk.close() // close the mini app (same as the user tapping ✕)

Older mini apps may still use these. You do not need them:

Method	What it does today
setHeader(params)	Nothing. The native header is hidden; draw your own.
postMessage(action, params)	Sends a raw bridge message. Prefer the typed methods.