fix: guard unmanaged resolution on authoritative balances

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

trex_core/adapters/broker/ownership.py

@@ -13,7 +13,6 @@ import os
 from datetime import datetime
 from pathlib import Path
 from threading import Lock
-from typing import Optional
 
 from trex_core.application.broker_port import (
     BalanceItem,
@@ -134,8 +133,8 @@ class OwnershipAwareBroker:
         *,
         side: str,
         symbol: str,
-        order_date: Optional[str] = None,
-        submitted_at: Optional[datetime] = None,
+        order_date: str | None = None,
+        submitted_at: datetime | None = None,
     ) -> FillStatus:
         result = self._delegate.poll_fill(
             broker_order_id,
@@ -175,6 +174,10 @@ class OwnershipAwareBroker:
     def get_balance(self) -> list[BalanceItem]:
         return self._store.project(self._delegate.get_balance())
 
+    def exposes_full_balance_snapshot(self) -> bool:
+        """False: projected balances omit operator-owned/unmanaged broker positions."""
+        return False
+
     def account_scope_hash(self) -> str:
         return self._delegate.account_scope_hash()