完善生命周期持仓与当前日滚动语义

crates/fidc-core/src/data.rs

@@ -2362,6 +2362,18 @@ impl DataSet {
         }
     }
 
+    pub fn market_current_numeric_values(
+        &self,
+        date: NaiveDate,
+        symbol: &str,
+        field: &str,
+        lookback: usize,
+    ) -> Vec<f64> {
+        self.market_series(symbol)
+            .map(|series| series.trailing_numeric_values(date, lookback, field, true))
+            .unwrap_or_default()
+    }
+
     pub fn factor_numeric_values(
         &self,
         date: NaiveDate,