Fix Bybit isolated balance sizing

tests/test_risk.py

@@ -59,6 +59,16 @@ def test_existing_exposure_does_not_cap_position(engine, rules):
     assert result.notional == Decimal(30000)
 
 
+def test_minimum_quantity_error_reports_sizing_inputs(engine, rules):
+    empty_account = AccountSnapshot(Decimal(10000), Decimal(0), Decimal(0), 0)
+
+    with pytest.raises(
+        OrderRejected,
+        match=r"quantity 0.*minimum 0\.001.*available_balance=0.*leverage=3.*entry_price=100",
+    ):
+        engine.validate_open(request(), empty_account, rules)
+
+
 @pytest.mark.parametrize(
     "overrides, message",
     [