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9ee6435f0e
Modal-hosted OpenAI-compatible endpoints (self-hosted Kimi K3 via
Modal free tier) return HTTP 429 with body {"error":"usage limit
reached"} when the account's credit is exhausted. Previously no
QUOTA_PATTERNS regex matched this bare-string error shape, so the 429
fell through to rate_limit (60s short cooldown). Combined with combo
round-robin's per-conversation session stickiness (#3825), this kept
re-targeting the same exhausted connection every turn instead of
locking it out and failing over to an account with remaining credit.
Add a substring pattern matching the JSON key/value pair
"error":"usage limit reached" with tolerance for trailing
punctuation and whitespace. Only the exact "error" key matches;
different keys or qualified transient messages like "Per-minute usage
limit reached" stay classified as rate_limit.
Signed-off-by: Minxi Hou <houminxi@gmail.com>