The /etc/gamecult/minds path is not visible to Persona shells. The settled path is
/var/lib/mind-<persona>/sealed-motion.key, 0400, owned by mind-<persona>, which is also the signer.
A key is registered only after the Persona shell signs a throwaway envelope that verifies
against the printed public half (gamecult-ops scripts/verify-sealed-motion-key.sh).
Docs only; tools/sealed-motion-sign.mjs names no path.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>