feat: fundational classes for constraints #193

	name: Static code check
	on: [push, pull_request]
	jobs:
	ruff:
	runs-on: ubuntu-latest
	steps:
	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	# run on a "fresh" python
	python-version: 3.12
	- name: Checkout
	uses: actions/checkout@v4
	- name: Install hatch
	run: python -m pip install hatch
	- name: Check code
	run: hatch fmt --check

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