fix: fixed suggestions

Co-authored-by: Copilot <[email protected]>

Author: Satvik-Singh192

src/quant_research_starter/tuning/__init__.py

@@ -1,5 +1,5 @@
 """Hyperparameter tuning with Optuna."""
 
-from .optuna_runner import OptunaRunner
+from .optuna_runner import OptunaRunner, create_backtest_objective
 
-__all__ = ["OptunaRunner"]
+__all__ = ["OptunaRunner", "create_backtest_objective"]