Add a primer on design of experiments and factorial design to README #46

	name: checkpoints

	# Keeps the in-lesson "✋ Quick exercise" checkpoints honest on every change:
	# verifies each one has the 3-cell structure and that every starter cell and
	# Python solution parses without syntax errors. Fast and dependency-light
	# (only needs nbformat). Full kernel execution is available locally with:
	# python scripts/test_checkpoints.py --exec

	on:
	push:
	pull_request:
	workflow_dispatch:

	jobs:
	validate:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: "3.11"
	- run: pip install nbformat
	- name: Validate checkpoints (structure + syntax)
	run: python scripts/test_checkpoints.py
	# Cross-reference integrity is dependency-light (stdlib only), so we gate
	# it on every push too: catches stale "NB n" / "Module n" links that a
	# renumber or a moved lesson would otherwise leave dangling.
	- name: Validate notebook cross-references
	run: python scripts/check_nb_references.py

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