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## Problem When Antigravity returns HTTP 429 with `rate_limit_exceeded` error code, the model lockout system never records the failure, so the model is not cooled down despite being rate-limited. ### Root Cause Antigravity's 429 error text is: `"Resource has been exhausted (e.g. check quota)."` The QUOTA_PATTERNS in `classify429.ts` contained overly broad regexes: - `/resource.*exhaust/i` — matches "Resource has been exhausted" - `/check.*quota/i` — matches "check quota" This caused `classifyErrorText()` to return `QUOTA_EXHAUSTED` (wrong), which set `providerExhausted = true` in the combo target exhaustion logic. With `providerExhausted`, the retry path was skipped entirely, and while the "done retrying" path should still record lockout, the misclassification cascaded into incorrect provider-level exhaustion state. Additionally, `targetExhaustion.ts` used the raw error text string instead of the structured error code (`rate_limit_exceeded`) that was already parsed from the response body. ## Fix 1. **classify429.ts** — Removed overly broad `/resource.*exhaust/i` and `/check.*quota/i` from QUOTA_PATTERNS. Antigravity's rate-limit wording is not a true quota exhaustion signal. 2. **targetExhaustion.ts** — Added optional `structuredError` to `ApplyComboTargetExhaustionOptions`. When available, the structured error code (e.g. `rate_limit_exceeded`) takes precedence over raw error text for exhaustion classification. 3. **combo.ts** — Passes `structuredError` to both `applyComboTargetExhaustion` call sites (dispatch path + retry-or-rotate path). ## Effect `structuredError.code = "rate_limit_exceeded"` → classified as rate-limit (not quota) → `providerExhausted = false` → retry proceeds → `recordModelLockoutFailure` called → model enters lockout with proper cooldown (120s base, exponential backoff). ## Tests Added 2 new tests for `structuredError.code` precedence in exhaustion classification. All 28 related tests pass.