fix: change retrieval to non-parent retrieval

initial eval on parent retrieval doesn't yield good results

src/wandbot/rag/retrieval.py

@@ -3,7 +3,6 @@
 from langchain.retrievers.document_compressors import CohereRerank
 from langchain_core.documents import Document
 from langchain_core.runnables import Runnable, RunnablePassthrough
-
 from wandbot.rag.utils import get_web_contexts
 from wandbot.retriever.base import VectorStore
 from wandbot.retriever.web_search import YouSearch, YouSearchConfig
@@ -64,7 +63,7 @@ def __init__(
         self.top_k = top_k
         self.search_type = search_type
 
-        self.retriever = self.vectorstore.as_parent_retriever(
+        self.retriever = self.vectorstore.as_retriever(
             search_type=self.search_type, search_kwargs={"k": self.top_k}
         )