fix: preserve multi-cause reconcile warnings and align slot blocking

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

tests/application/test_verify.py

@@ -313,6 +313,40 @@ def test_verify_c_case_clear_preserves_b_case_warning():
     assert b_info is not None and b_info["case_code"] == "B"
 
 
+def test_verify_c_case_clear_on_slot_with_b_and_c_keeps_b():
+    sym = "005930"
+    slot = _make_slot(status=SlotState.HOLDING, symbol=sym, pid="pf-c")
+
+    repo = InMemorySlotRepository()
+    repo.add_slot(slot)
+
+    ws = InMemoryReconcileWarningStore()
+    slot_id = str(slot.slot_id)
+    ws.set_warned(slot_id, portfolio_id="pf-c", case_code="B")
+    ws.set_warned(slot_id, portfolio_id="pf-c", case_code="C")
+
+    store = SnapshotStore()
+    store.swap([
+        PortfolioItem(portfolio_id="pf-c", symbol=sym, cash_balance=0.0, asset_quantity=10.0),
+    ])
+    broker = FakeBroker({sym: 10})
+
+    result = verify_slot_reconcile(
+        portfolio_id="pf-c",
+        store=store,
+        broker=broker,
+        slot_repo=repo,
+        instance_key=INSTANCE,
+        warn_store=ws,
+    )
+
+    assert result["result"] == "cleared"
+    assert ws.is_warned(slot_id) is True
+    info = ws.get_warning_info(slot_id)
+    assert info is not None
+    assert info["case_codes"] == ["B"]
+
+
 def test_verify_c_case_clear_non_holding_slot():
     """A non-HOLDING slot with C-case warning for the same symbol must also be cleared."""
     sym = "005930"
@@ -360,11 +394,11 @@ class _FailAfterNStore(InMemoryReconcileWarningStore):
         self._calls = 0
         self._fail_after = fail_after
 
-    def clear_warned(self, slot_id: str) -> None:
+    def clear_warned(self, slot_id: str, *, case_code: str | None = None) -> None:
         self._calls += 1
         if self._calls > self._fail_after:
             raise RuntimeError("simulated DB error")
-        super().clear_warned(slot_id)
+        super().clear_warned(slot_id, case_code=case_code)
 
 
 def test_verify_partial_clear_failure_returns_clear_failed():