fix: guard unmanaged resolution on authoritative balances

Co-authored-by: genichin <4282227+genichin@users.noreply.github.com>

tests/application/test_unmanaged_position_lifecycle.py

@@ -35,6 +35,11 @@ class RaisingBroker(FakeBroker):
         raise BrokerBalanceError("transport_failed")
 
 
+class FilteredBroker(FakeBroker):
+    def exposes_full_balance_snapshot(self) -> bool:
+        return False
+
+
 def _wire():
     repo = InMemorySlotRepository()
     return repo, SlotService(repo, instance_key=INSTANCE)
@@ -188,3 +193,22 @@ def test_broker_failure_does_not_resolve_unmanaged_state():
     state = store.get_state(instance_key=INSTANCE, symbol="008110")
     assert state is not None
     assert state["lifecycle_state"] == "active"
+
+
+def test_non_authoritative_broker_view_does_not_resolve_unmanaged_state():
+    repo, svc = _wire()
+    store = InMemoryUnmanagedPositionStore()
+    store.observe(instance_key=INSTANCE, symbol="008110", quantity=3)
+
+    decisions = reconcile_core_holdings(
+        slot_repo=repo,
+        slot_service=svc,
+        broker=FilteredBroker({}),
+        instance_key=INSTANCE,
+        unmanaged_position_store=store,
+    )
+
+    assert decisions == {}
+    state = store.get_state(instance_key=INSTANCE, symbol="008110")
+    assert state is not None
+    assert state["lifecycle_state"] == "active"