When an auth profile hits a rate limit, `errorCount` is incremented and
`cooldownUntil` is set with exponential backoff. After the cooldown
expires, the time-based check correctly returns false — but `errorCount`
persists. The next transient failure immediately escalates to a much
longer cooldown because the backoff formula uses the stale count:
60s × 5^(errorCount-1), max 1h
This creates a positive feedback loop where profiles appear permanently
stuck after rate limits, requiring manual JSON editing to recover.
Add `clearExpiredCooldowns()` which sweeps all profiles on every call to
`resolveAuthProfileOrder()` and clears expired `cooldownUntil` /
`disabledUntil` values along with resetting `errorCount` and
`failureCounts` — giving the profile a fair retry window (circuit-breaker
half-open → closed transition).
Key design decisions:
- `cooldownUntil` and `disabledUntil` handled independently (a profile
can have both; only the expired one is cleared)
- `errorCount` reset only when ALL unusable windows have expired
- `lastFailureAt` preserved for the existing failureWindowMs decay logic
- In-memory mutation; disk persistence happens lazily on the next store
write, matching the existing save pattern
Fixes#3604
Related: #13623, #15851, #11972, #8434
