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/utils/technical_indicators_tools.py

@@ -1,7 +1,10 @@
-from langchain_core.tools import tool
 from typing import Annotated
+
+from langchain_core.tools import tool
+
 from tradingagents.dataflows.interface import route_to_vendor
 
+
 @tool
 def get_indicators(
     symbol: Annotated[str, "ticker symbol of the company"],
@@ -29,4 +32,4 @@ def get_indicators(
             results.append(route_to_vendor("get_indicators", symbol, ind, curr_date, look_back_days))
         except ValueError as e:
             results.append(str(e))
-    return "\n\n".join(results)
+    return "\n\n".join(results)