The key parsers now return the key in the form that the user gave. Each
device takes the form that it keeps: a firmware companion expands a seed
to the 64 bytes that it accepts, and the node of an SPI radio saves the
seed as it is, the same form as a key that it makes itself. A seed is the
more complete form, and the radio library signs with it through PyNaCl.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>