Add process event bus to backtest engine

crates/fidc-core/src/lib.rs

@@ -3,6 +3,7 @@ pub mod calendar;
 pub mod cost;
 pub mod data;
 pub mod engine;
+pub mod event_bus;
 pub mod events;
 pub mod instrument;
 pub mod metrics;
@@ -26,6 +27,7 @@ pub use engine::{
     BacktestConfig, BacktestDayProgress, BacktestEngine, BacktestError, BacktestResult,
     DailyEquityPoint,
 };
+pub use event_bus::ProcessEventBus;
 pub use events::{
     AccountEvent, FillEvent, OrderEvent, OrderSide, OrderStatus, PositionEvent, ProcessEvent,
     ProcessEventKind,