feat: paginate KIS balance inquiries

tests/application/test_reconciliation.py

@@ -1,7 +1,9 @@
 """Position reconciliation tests (REQ-031)."""
 from __future__ import annotations
 
-from trex_core.application.broker_port import BalanceItem
+import pytest
+
+from trex_core.application.broker_port import BalanceItem, BrokerBalanceError
 from trex_core.application.portfolio import PortfolioItem, SnapshotStore
 from trex_core.application.reconciliation import reconcile_positions
 
@@ -16,6 +18,11 @@ class FakeBroker:
     def get_balance(self): return list(self._b)
 
 
+class FailingBroker(FakeBroker):
+    def get_balance(self):
+        raise BrokerBalanceError("malformed_response")
+
+
 def _store_with(*items):
     store = SnapshotStore()
     store.swap(list(items))
@@ -47,6 +54,20 @@ def test_subsequent_match_auto_clears_warning():
     assert store.warnings() == set()
 
 
+def test_reconcile_positions_accepts_symbol_from_complete_later_page_snapshot():
+    store = _store_with(
+        PortfolioItem(portfolio_id="pf-later", symbol="000660", cash_balance=0, asset_quantity=4),
+    )
+
+    decisions = reconcile_positions(
+        store=store,
+        broker=FakeBroker([BalanceItem("000660", 4)]),
+    )
+
+    assert decisions == {"pf-later": "ok"}
+    assert store.warnings() == set()
+
+
 def test_multiple_portfolios_same_symbol_aggregate():
     store = _store_with(
         PortfolioItem(portfolio_id="pf-A", symbol="005930",
@@ -86,3 +107,14 @@ def test_paper_broker_returns_deterministic_balance():
     syms = {b.symbol for b in broker.get_balance()}
     assert "000660" not in syms        # net 0 → dropped
     assert "005930" in syms
+
+
+def test_reconcile_positions_propagates_balance_failure_without_warning_write():
+    store = _store_with(
+        PortfolioItem(portfolio_id="pf-A", symbol="005930", cash_balance=0, asset_quantity=10),
+    )
+
+    with pytest.raises(BrokerBalanceError, match="malformed_response"):
+        reconcile_positions(store=store, broker=FailingBroker([]))
+
+    assert store.warnings() == set()