feat: set minimun returned memories back to 3 (#280)

* feat: parallel doc process

* add memory size config for tree

* feat: add reranker Facktory

* feat: pass reranker from tree config

* feat: add reranker config in mos product

* style: modify annotation

* feat: slightly adjust similarity threshold for returned memories

* test: fix researcher test script

* fix: reranker config bug

* feat: similarity threshold 0.52->0.30

* feat: min memories:3

Author: CaralHsi

src/memos/mem_os/product.py

@@ -693,7 +693,7 @@ def run_async_in_thread():
             thread.start()
 
     def _filter_memories_by_threshold(
-        self, memories: list[TextualMemoryItem], threshold: float = 0.30, min_num: int = 0
+        self, memories: list[TextualMemoryItem], threshold: float = 0.30, min_num: int = 3
     ) -> list[TextualMemoryItem]:
         """
         Filter memories by threshold.