authenticate
open suspend override fun authenticate(context: Context): Result<Pair<PrivateKey, BiometricPrompt.CryptoObject?>>
Authenticates and retrieves the private key without requiring user verification.
Since this is a "None" authenticator, no actual authentication is performed. The method simply checks if a private key exists and returns it immediately. No CryptoObject is returned since no authentication UI is involved.
Return
A Result containing a Pair of the PrivateKey and null CryptoObject on success, or a DeviceNotRegisteredException if no key is found
Parameters
context
The Android context (unused in this implementation)