fix(incidents): batch decision token lookup

apps/api/tests/test_incidents_list_pure_read.py

@@ -30,8 +30,15 @@ class _IncidentService:
 class _DecisionManager:
     def __init__(self) -> None:
         self.created = 0
+        self.single_token_lookups = 0
+        self.batch_token_lookups = 0
+
+    async def _find_existing_tokens_for_incidents(self, incident_ids: list[str]):
+        self.batch_token_lookups += 1
+        return {}
 
     async def _find_existing_token(self, incident_id: str):
+        self.single_token_lookups += 1
         return None
 
     async def get_or_create_decision(self, *args, **kwargs):
@@ -51,3 +58,5 @@ async def test_list_incidents_does_not_trigger_ai_decision_by_default(monkeypatc
     assert result.incidents[0].incident_id == "INC-20260506-PURE01"
     assert result.incidents[0].decision is None
     assert decision_manager.created == 0
+    assert decision_manager.batch_token_lookups == 1
+    assert decision_manager.single_token_lookups == 0