fix(classify429): add missing 'exhausted their quota' pattern to prevent combo fallback failure (#9269)

changelog.d/fixes/9269-fix.plan.md

@@ -0,0 +1 @@
+- **fix(classify429):** add missing `have exhausted their quota` pattern so the synthetic 429 from auth.ts is recognized as quota exhaustion, preventing the combo loop from burning retries against the same provider instead of falling back to a healthy one ([#9269](https://github.com/diegosouzapw/OmniRoute/issues/9269))

src/shared/utils/classify429.ts

@@ -66,6 +66,14 @@ const QUOTA_PATTERNS: ReadonlyArray<RegExp> = [
   // the 429 is misclassified as transient rate_limit and retried every
   // ~60s against a budget that only resets at UTC midnight.
   /daily free allocation/i,
+
+  // OmniRoute auth-layer synthetic 429 (Issue #9269).
+  // Body: "All antigravity accounts have exhausted their quota (reset after 5m)"
+  // Produced by auth.ts line 1477 when every account for a provider has
+  // exhausted its quota. Without this pattern, the message is classified as
+  // a transient rate-limit and the combo loop burns retries against the
+  // same provider instead of falling back to a healthy one.
+  /have exhausted their quota/i,
 ];
 
 /**

tests/unit/classify429.test.ts

@@ -44,6 +44,13 @@ test("classify429: Antigravity 'Individual quota reached' body returns 'quota_ex
   assert.equal(classify429({ status: 429, body: { error: { message: body } } }), "quota_exhausted");
 });
 
+test("classify429: auth-layer synthetic 'have exhausted their quota' returns 'quota_exhausted' (#9269)", () => {
+  const body = "All antigravity accounts have exhausted their quota (reset after 5m)";
+  assert.equal(looksLikeQuotaExhausted(body), true);
+  assert.equal(classify429({ status: 429, body }), "quota_exhausted");
+  assert.equal(classify429({ status: 429, body: { error: { message: body } } }), "quota_exhausted");
+});
+
 test("classify429: Google RESOURCE_EXHAUSTED with a billing-period reset is quota exhausted", () => {
   const body = "Resource has been exhausted (e.g. check quota). (reset after 24h)";
   assert.equal(looksLikeQuotaExhausted(body), true);