v0.2.0

Release/v0.2.0 (#9)

* first impl. bootstrap merging methods

* generalize to all mergers

* fill the bootstrap when fill

* add mergers to def on an ensemble, simplify code

* add refit

* rename stability agrrement and add stability of folds

* Fix seed management and cross-fold stability keys

* Fix Pareto analysis with failed ensembles (-inf values)

* Add performance optimizations: remove re-instantiation and add metrics caching

* Refactor to single-stage Pareto with consistency metric

* Simplify bootstrap and clarify stability modes

* chore: Prepare v0.2.0 release

* Remove CLI interface and scripts directory

- Remove scripts/ directory (main.py, utils.py, config.yml)
- Remove test_main_script.py and tests/config_test.yml
- Remove efs-pipeline entry point from pyproject.toml
- Remove pyyaml dependency (only used by CLI)
- Update README to remove CLI documentation
- Update CHANGELOG with CLI removal notice

Users should use the Python API directly instead of the CLI.