Merge pull request 'feat: CI timing gate flakes under runner load' (#1292) from timmy/1289-ci-timing-gate-flakes-under-runner-load into main

tests/test_authored_idempotency.py

@@ -419,11 +419,12 @@ async def test_slow_ledger_completion_does_not_block_health_requests(monkeypatch
         return {"id": 249, "body": body}
 
     started = threading.Event()
+    release = threading.Event()
     original_complete = main._idempotency_ledger.complete
 
     def slow_complete(key, response):
         started.set()
-        time.sleep(0.2)
+        assert release.wait(1)
         return original_complete(key, response)
 
     monkeypatch.setattr(main._idempotency_ledger, "complete", slow_complete)
@@ -432,15 +433,16 @@ async def test_slow_ledger_completion_does_not_block_health_requests(monkeypatch
     transport = httpx.ASGITransport(app=main.app)
 
     async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
-        started_at = asyncio.get_running_loop().time()
         authored = asyncio.create_task(client.post(
             "/api/v1/repos/stackchain/api/issues/248/comments",
             json={"body": "Persist without freezing"},
             headers={"Idempotency-Key": "slow-completion-248"},
         ))
         assert await asyncio.to_thread(started.wait, 1)
+        started_at = asyncio.get_running_loop().time()
         health = await client.get("/healthz")
         health_elapsed = asyncio.get_running_loop().time() - started_at
+        release.set()
         authored_response = await authored
 
     assert health.status_code == 200