- Implemented `compute_oof_error_envelope` to calculate absolute prediction-error envelopes and safety margins for adaptive surrogate validation.
- Added `build_local_oof_error_table` to create a one-row-per-sample OOF residual table for local safety margins.
- Updated `run_nested_cv_rbf_for_target` to utilize the new functions and return validation envelopes and local OOF error data.
- Enhanced `main` function to save validation envelopes and local OOF errors to CSV files.
- Modified shell scripts to adjust parameters for training and optimization.
- Introduced unit tests for new optimization logic, including safety margin calculations and local OOF error table construction.