增加next open末日执行诊断

crates/fidc-core/src/engine.rs

@@ -4888,7 +4888,14 @@ mod tests {
     fn current_bar_close_uses_decision_day_close_for_fill() {
         let result = run_with_matching(MatchingType::CurrentBarClose, PriceField::Close, 0);
 
-        assert_eq!(result.fills.len(), 1);
+        assert_eq!(
+            result.fills.len(),
+            1,
+            "orders={:?}; equity={:?}; process={:?}",
+            result.order_events,
+            result.equity_curve,
+            result.process_events
+        );
         assert_eq!(result.fills[0].date, d(2025, 1, 2));
         assert_eq!(result.fills[0].price, 11.5);
     }