Detect and surface atomic passkey counter anomalies #642
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Reference: stackchain/stackchain-dashboard#642
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Delete Branch "timmy/641-passkey-counter-anomalies"
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Closes #641
Atomically compare-and-swap WebAuthn assertion counters across workers, preserve counterless authenticators, deny stale sign-in/authorization before credentials are issued, and surface bounded remediation guidance in Security Activity.
Tests:
python3 -m pytest tests/ -q(1293 passed).