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

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

tests/runtime/test_cli_operator.py

@@ -418,7 +418,7 @@ def test_sync_fail_closed_skipped_error_exits_nonzero_without_writes(
             return SimpleNamespace(get_balance=lambda: []), None
 
     class _WarningStore:
-        def clear_warned(self, *_args):
+        def clear_warned(self, *_args, **_kwargs):
             raise AssertionError("warning clear must not be called")
 
     class _Connection: