Add suspended and ST data helpers

crates/fidc-core/src/strategy.rs

@@ -285,6 +285,16 @@ impl StrategyContext<'_> {
         self.data.next_trading_date(date, n)
     }
 
+    pub fn is_suspended(&self, symbol: &str, count: usize) -> Vec<bool> {
+        self.data
+            .is_suspended_flags(self.execution_date, symbol, count)
+    }
+
+    pub fn is_st_stock(&self, symbol: &str, count: usize) -> Vec<bool> {
+        self.data
+            .is_st_stock_flags(self.execution_date, symbol, count)
+    }
+
     pub fn has_subscriptions(&self) -> bool {
         !self.subscriptions.is_empty()
     }