Export
exportEvmKey() and exportSolanaKey() each run a passkey gesture and return the raw private key
as a hex string. They are available only on a self-custody (own-origin) client.
useExport, which exposes both mutations with shared pending and error:
The EVM key is the root; the Solana key is a leaf derived from it. Export returns raw keys, never a
mnemonic phrase. Avok never mints one.