hydra-ecosystem/hydra ? reverse-engineered prompt

Build me a Python library for configuring complex apps in a really clean way.

I want a setup where an app can be driven by simple config files, command line overrides, and reusable defaults, so it’s easy to switch between experiments or environments without rewriting code every time. Make it feel polished for real Python projects, with good docs, examples, tests, and support for modern Python versions.

It should help users organize settings for things like training jobs, services, and scripts, and make it easy to compose configuration from multiple sources. Please include a small example app and enough structure that people can extend it with plugins or custom config behavior later.

If anything is unclear, look up the current docs online and follow the project’s existing style.