feat: add Python code execution tool and RAG side project with Makefile targets

Makefile

@@ -65,4 +65,11 @@ docker_run:
 	docker run -v .:/app --rm -it r
 
 build_deb:
-	dpkg-deb --build r_package
+	dpkg-deb --build r_package
+
+# --- RAG Side Project ---
+rag_test: rag_test.c rag.c db_utils.c rag.h db_utils.h
+	$(CC) -o rag_test rag_test.c rag.c db_utils.c -lsqlite3 -ljson-c
+
+run_rag_test: rag_test
+	./rag_test