A 402 (e.g. Kilo "usage_limit_exceeded"/out of credits) is deterministic:
retrying the same provider only burns the failure budget and needlessly
disables it within a single request. Add 402 to the non-retryable set so
the rotation fails over to the next provider immediately.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>