fix: Lower knowledge search score threshold for better recall

- Reduce score threshold from 0.35 to 0.25 to include more relevant results
- This helps improve knowledge effectiveness while maintaining quality

Part of #2269

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/knowledge/storage/knowledge_storage.py

@@ -59,7 +59,7 @@ class KnowledgeStorage(BaseKnowledgeStorage):
         query: List[str],
         limit: int = 3,
         filter: Optional[dict] = None,
-        score_threshold: float = 0.35,
+        score_threshold: float = 0.25,
     ) -> List[Dict[str, Any]]:
         with suppress_logging():
             if self.collection: