fix: persist uncertain cancel outcomes

tests/adapters/broker/test_kis.py

@@ -12,7 +12,11 @@ import httpx
 import pytest
 
 from trex_core.adapters.broker.kis import KISBroker
-from trex_core.application.broker_port import BrokerBalanceError, OrderRequest
+from trex_core.application.broker_port import (
+    BrokerBalanceError,
+    CancelState,
+    OrderRequest,
+)
 
 _MOCK_URL = "https://openapivts.koreainvestment.com:29443"
 
@@ -179,15 +183,13 @@ def test_submit_transport_failure_blocks_automatic_duplicate(monkeypatch):
     assert ack.accepted is True
     assert ack.broker_order_id.startswith("submission-unknown:")
     assert ack.reason == "submit_outcome_unknown:ReadTimeout"
-    assert (
-        b.cancel_order(
-            ack.broker_order_id,
-            side="buy",
-            symbol="005930",
-            qty=4,
-        )
-        is False
+    cancel = b.cancel_order(
+        ack.broker_order_id,
+        side="buy",
+        symbol="005930",
+        qty=4,
     )
+    assert cancel.state is CancelState.UNKNOWN
 
 
 def test_submit_gateway_5xx_blocks_automatic_duplicate(monkeypatch):