update requirements and hybrid_retriever_tool files

tools/hybrid_retriever_tool.py

@@ -3,12 +3,12 @@ from rank_bm25 import BM25Okapi
 from sentence_transformers import SentenceTransformer
 from tavily import TavilyClient
 from openai import OpenAI
+from crewai_tools import BaseTool
 import os
 
-class HybridRetrieverTool:
-    """
-    Dynamically builds a hybrid BM25 + semantic retriever from live Tavily results.
-    """
+class HybridRetrieverTool(BaseTool):
+    name = "Hybrid Retriever Tool"
+    description = "Combines BM25 keyword scoring with semantic similarity for hybrid retrieval"
 
     def __init__(self, alpha=0.6):
         self.alpha = alpha