setup RAG (#6146)

engine/tests/test_stirling_contracts.py

@@ -73,11 +73,22 @@ def test_pdf_question_answer_defaults_evidence_list() -> None:
 
 
 def test_app_settings_accepts_model_configuration() -> None:
+    from pathlib import Path
+
+    from stirling.config import RagBackend
+
     settings = AppSettings(
         smart_model_name="claude-sonnet-4-5-20250929",
         fast_model_name="claude-haiku-4-5-20251001",
         smart_model_max_tokens=8192,
         fast_model_max_tokens=2048,
+        rag_backend=RagBackend.SQLITE,
+        rag_embedding_model="voyageai:voyage-4",
+        rag_store_path=Path(":memory:"),
+        rag_pgvector_dsn="",
+        rag_chunk_size=512,
+        rag_chunk_overlap=64,
+        rag_default_top_k=5,
         posthog_enabled=False,
         posthog_api_key="",
         posthog_host="https://eu.i.posthog.com",