HF RL Explorer

Issue: Add hyperparameter tuning support to the framework

Issue: Add hyperparameter tuning support to the framework: a task in LegoFlow-SWE (Harbor dataset). Problem Oumi currently has no built‑in way to perform hyperparameter optimization or search. Users who want to run studies (e.g., with Optuna) cannot define a tuning configuration, specify search…

The task

**Problem** Oumi currently has no built‑in way to perform hyperparameter optimization or search. Users who want to run studies (e.g., with Optuna) cannot define a tuning configuration, specify search spaces, or launch a tuning run within the framework.

Part of Lego-X/LegoFlow-SWE.