Update src/qa.py

src/qa.py

@@ -218,7 +218,7 @@ REASONING_PROMPT = (
 from vectorstore import build_faiss_index
 
 def retrieve_chunks(query: str, index, chunks: list, top_k: int = 7,
-                    min_similarity: float = 0.4, candidate_multiplier: int = 3,
+                    min_similarity: float = 0.6, candidate_multiplier: int = 3,
                     embeddings: list = None):
     """
     Retrieves the most relevant chunks using FAISS similarity + reranking.