Add open auction strategy hook

crates/fidc-core/src/engine.rs

@@ -203,6 +203,7 @@ where
                 portfolio: &portfolio,
             };
             self.strategy.before_trading(&daily_context)?;
+            self.strategy.open_auction(&daily_context)?;
 
             let decision = decision_slot
                 .map(|(decision_idx, decision_date)| {

crates/fidc-core/src/strategy.rs

@@ -18,6 +18,9 @@ pub trait Strategy {
     fn before_trading(&mut self, _ctx: &StrategyContext<'_>) -> Result<(), BacktestError> {
         Ok(())
     }
+    fn open_auction(&mut self, _ctx: &StrategyContext<'_>) -> Result<(), BacktestError> {
+        Ok(())
+    }
     fn on_day(&mut self, ctx: &StrategyContext<'_>) -> Result<StrategyDecision, BacktestError>;
     fn after_trading(&mut self, _ctx: &StrategyContext<'_>) -> Result<(), BacktestError> {
         Ok(())