feat: 1. replace black with ruff for fomatting and sort import (#489)

2. use tavily from`langchain-tavily` rather than the older one from `langchain-community`

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

src/prose/graph/builder.py

@@ -3,6 +3,7 @@
 
 import asyncio
 import logging
+
 from langgraph.graph import END, START, StateGraph
 
 from src.prose.graph.prose_continue_node import prose_continue_node

src/prose/graph/prose_improve_node.py

@@ -7,8 +7,8 @@ from langchain.schema import HumanMessage, SystemMessage
 
 from src.config.agents import AGENT_LLM_MAP
 from src.llms.llm import get_llm_by_type
-from src.prose.graph.state import ProseState
 from src.prompts.template import get_prompt_template
+from src.prose.graph.state import ProseState
 
 logger = logging.getLogger(__name__)