risk: add kill-switch refresh retry policy and tests (#377)

src/main.py

@@ -1384,6 +1384,7 @@ async def _refresh_order_state_for_kill_switch(
     overseas_broker: OverseasBroker,
     markets: list[MarketInfo],
 ) -> None:
+    failures: list[str] = []
     seen_overseas: set[str] = set()
     for market in markets:
         try:
@@ -1399,6 +1400,9 @@ async def _refresh_order_state_for_kill_switch(
                 market.exchange_code,
                 exc,
             )
+            failures.append(f"{market.code}/{market.exchange_code}: {exc}")
+    if failures:
+        raise RuntimeError("; ".join(failures[:3]))
 
 
 def _reduce_risk_for_kill_switch() -> None: