chore(lint): make the repository ruff-clean under the strict select

Clear the deferred full-repo lint backlog so the whole tree passes the strict
ruff select (E,W,F,I,B,UP,C4,SIM). Mechanical fixes dominate: import sorting,
pep585/604 annotations, dropped dead imports, and whitespace. The few semantic
changes are behavior-preserving: declare __all__ on the agent_utils and
alpha_vantage re-export hubs; expand 'from x import *' to explicit names; use
immutable tuple defaults instead of mutable list defaults; contextlib.suppress
for try/except/pass; and narrow an over-broad assertRaises.

tradingagents/agents/analysts/fundamentals_analyst.py

@@ -1,14 +1,13 @@
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
+
 from tradingagents.agents.utils.agent_utils import (
-    get_instrument_context_from_state,
     get_balance_sheet,
     get_cashflow,
     get_fundamentals,
     get_income_statement,
-    get_insider_transactions,
+    get_instrument_context_from_state,
     get_language_instruction,
 )
-from tradingagents.dataflows.config import get_config
 
 
 def create_fundamentals_analyst(llm):

tradingagents/agents/analysts/market_analyst.py

@@ -1,12 +1,12 @@
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
+
 from tradingagents.agents.utils.agent_utils import (
-    get_instrument_context_from_state,
     get_indicators,
+    get_instrument_context_from_state,
     get_language_instruction,
     get_stock_data,
     get_verified_market_snapshot,
 )
-from tradingagents.dataflows.config import get_config
 
 
 def create_market_analyst(llm):

tradingagents/agents/analysts/news_analyst.py

@@ -1,13 +1,13 @@
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
+
 from tradingagents.agents.utils.agent_utils import (
-    get_instrument_context_from_state,
     get_global_news,
+    get_instrument_context_from_state,
     get_language_instruction,
     get_macro_indicators,
     get_news,
     get_prediction_markets,
 )
-from tradingagents.dataflows.config import get_config
 
 
 def create_news_analyst(llm):