Account-reset hint evaluated before short retry hints; account-scoped caps rotate on status 403 or undefined (Devin statusless trailer); statusless concurrency caps marked transient; transient same-model retries use the concurrency backoff.
Refuted: quota-worded concurrency caps were already excluded from rotation before the usage-limit text match.
(cherry picked from commit f2b9a18d715ddbcb6ae703670f2212da36bb2826)
- Restored the fetchWithRetry early return for Retry-After and quota hints larger than maxDelayMs.
- Added coverage so oversized provider retry hints do not sleep and retry internally.
- Introduced `FetchImpl` type with optional `preconnect` to accept non-Bun fetch implementations without type errors.
- Applied the new type across all providers and `StreamOptions.fetch`.
- Added tests verifying fetch override routing for openai-completions, openai-responses, and fetchWithRetry.
