- Swap the strict counter checker for a zero-tolerant one so platform
authenticators / synced passkeys (which always report counter 0) can assert,
while non-zero counters still must strictly increase (clone detection).
- Guard registration (options + register) and the UI on hasTwoFactorEnabled, so a
key is never created against a disabled/reset second factor.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
boban