setup RAG (#6146)

engine/src/stirling/rag/__init__.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+from stirling.rag.capability import RagCapability
+from stirling.rag.embedder import EmbeddingService
+from stirling.rag.pgvector_store import PgVectorStore
+from stirling.rag.service import RagService
+from stirling.rag.sqlite_vec_store import SqliteVecStore
+from stirling.rag.store import Document, SearchResult, VectorStore
+
+__all__ = [
+    "Document",
+    "EmbeddingService",
+    "PgVectorStore",
+    "RagCapability",
+    "RagService",
+    "SearchResult",
+    "SqliteVecStore",
+    "VectorStore",
+]