feat: add tool-call fallback and resilient batch exports

tests/unit/test_llm_gateway.py

@@ -301,6 +301,32 @@ async def test_configured_retry_budget_is_shared_by_identical_fallback(monkeypat
     assert llm_service._FAILED_ENDPOINTS.get() is None
 
 
+@pytest.mark.asyncio
+async def test_429_waits_one_minute_then_retries(monkeypatch):
+    from unittest.mock import AsyncMock
+    from artemis.llm.reliability import retry_policy_for
+
+    class RateLimited(Exception):
+        status_code = 429
+
+    calls = 0
+
+    async def call_once():
+        nonlocal calls
+        calls += 1
+        if calls == 1:
+            raise RateLimited("Too Many Requests")
+        return "recovered"
+
+    sleep = AsyncMock()
+    monkeypatch.setattr(llm_service, "retry_policy_for", retry_policy_for)
+    monkeypatch.setattr(llm_service.asyncio, "sleep", sleep)
+    monkeypatch.setattr(llm_service.settings, "OPENAI_RATE_LIMIT_RETRY_SECONDS", 60)
+    assert await llm_service._run_with_recovery(call_once, max_retries=1) == "recovered"
+    assert calls == 2
+    sleep.assert_awaited_once_with(60)
+
+
 @pytest.mark.asyncio
 async def test_request_deadline_cancels_attempt_and_respects_zero_retries(monkeypatch):
     import asyncio