- register_device() generates signing + deploy keypairs via core device
module, stores them in DEVICE_STATE (once_cell Lazy<Mutex>), and
returns only public keys to JS
- sign_for_git() signs data using the internal signing key
- get_device_info() returns name and public keys; returns null if not
registered
- clear_device() zeroes and drops device state (logout / re-registration)
- Removed generate_device_keypair() which exposed raw private key bytes
Fixes audit I5: private key material no longer crosses the WASM boundary.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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