add a linter

specifically: imports are all out of order in most files

The issue mentions that imports are out of order in most files. First, examine the project structure to see which Python files exist. Look for a linter like isort or flake8 that can sort imports. Check if there's a configuration file (like setup.cfg, pyproject.toml, or .isort.cfg) to understand the desired import order. Running a linter on a sample file will show the changes needed. The goal is to add a linter to the project's development workflow, possibly in a pre-commit hook or CI configuration.

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