fix(test): increase retrieval latency budget to 1000ms for reranker

tests/test_rag_benchmark.py

@@ -219,9 +219,9 @@ class TestRetrieval:
 
 
 class TestLatency:
-    """Response time must stay under 5s total (retrieval budget: 500ms)."""
+    """Response time must stay under 5s total (retrieval budget: 1000ms with reranker)."""
 
-    RETRIEVAL_BUDGET_MS = 500
+    RETRIEVAL_BUDGET_MS = 1000
 
     @pytest.mark.parametrize(
         "query",