fix: persist uncertain cancel outcomes

tests/adapters/broker/test_ownership.py

@@ -9,6 +9,8 @@ from trex_core.adapters.broker.ownership import (
 from trex_core.application.broker_port import (
     BalanceItem,
     BrokerBalanceError,
+    CancelOutcome,
+    CancelState,
     FillStatus,
     OrderAck,
 )
@@ -29,7 +31,7 @@ class FakeBroker:
         return self.fill
 
     def cancel_order(self, broker_order_id, *, side, symbol, qty, venue="KRX"):
-        return True
+        return CancelOutcome(CancelState.REQUESTED)
 
     def get_balance(self):
         return self.balance