Function register_simulation 

pub fn register_simulation(
    registry: &ToolRegistry,
    calibration_store: Option<Arc<Mutex<CalibrationStore>>>,
    self_model: Option<Arc<Mutex<SelfModel>>>,
) -> ToolRegistry

Register all simulation tools into a registry.

self_model (optional) enables calibration monitoring: the scorecard records the average Brier score into the self-model for drift alerts.