Per sneak. The age commands derive the identity at the generic path and
encrypt or decrypt with it, always including the identity's own
recipient. The mnemonic command derives child mnemonics through BIP-85's
own mnemonic application.
Model: fable-5-1
The name says what the tool is: a key is a function of the mnemonic and
an index, computed when asked for and stored nowhere. Directory, module,
binary and environment variables take it.
Model: fable-5-1
