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87b3bdf85e
Root-caused via a real Gemini-ban incident log: deprecated-model 404/410s (e.g. gemini-2.5-flash "no longer available to new users") fell through checkFallbackError's generic transient-cooldown branch, so combo/auto-routing kept re-selecting a permanently dead model every cooldown window forever — the hammering that got the account flagged as abusive. Fix: `MODEL_PERMANENTLY_UNAVAILABLE_PATTERNS` + `isModelPermanentlyUnavailable()` classify these as a 24h lockout instead, surfaced via `quotaResetHintMs` so combo's per-request model-lockout honors it in full. Validated: 6/6 new tests + 133/133 existing accountFallback/error-classification tests, no regressions. Thanks for tracing this end-to-end with real production logs!