The flap-limiter could 30-min quarantine a PAIRED, legitimate device on reconnect churn.
Behind Bold's single SNAT IP a repeated edge flush -> every device reconnects -> trips flap
-> quarantined -> a recoverable blip becomes a SUSTAINED FLEET-WIDE LOCKOUT we caused.
check(key, now, {paired}) now skips (and clears) the quarantine escalation for a paired
device — it still gets the brief soft cooldown if it truly hammers, but never the long
lockout. The register gate computes paired = device_id && validateDeviceToken(...) (a
matching STORED token, false for missing/mismatch) so a spoofed device_id can't claim the
exemption; unpaired/anon flapping (attacker / unprovisioned hammering) still quarantines.
Tests: unpaired flapper still quarantined; paired never quarantined (soft cooldown only);
paired creds RELEASE an in-flight quarantine; N paired devices from one SNAT IP all admitted
on reconnect and never quarantined across repeated flush cycles.
