update 4b #29

	name: notebooks

	# Verify every .ipynb is in sync with its paired py:percent .py file.
	# This is a fast, dependency-light check — it does NOT execute the notebooks.

	on:
	push:
	paths:
	- "notebooks/**"
	- ".github/workflows/notebooks.yml"
	pull_request:
	paths:
	- "notebooks/**"
	- ".github/workflows/notebooks.yml"

	jobs:
	jupytext-sync:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- uses: actions/setup-python@v5
	with:
	python-version: "3.11"

	# Pin to the same jupytext version used locally / in the pre-commit hook,
	# so canonical formatting matches and the check doesn't flag version drift.
	- name: Install jupytext
	run: pip install "jupytext==1.19.4"

	# Sync every notebook with its paired .py. On a clean, in-sync checkout this
	# is a no-op. If a committed .ipynb and its .py disagree, sync rewrites one
	# side to reconcile them, leaving the working tree dirty.
	- name: Sync notebooks
	run: \|
	find notebooks -name '*.ipynb' -print0 \| xargs -0 -n1 jupytext --sync

	# Fail if syncing changed anything: that means the committed pair was stale.
	- name: Fail if notebooks were out of sync
	run: \|
	if ! git diff --quiet; then
	echo "::error::Some notebooks are out of sync with their paired .py files."
	echo "Fix locally with: jupytext --sync \"notebooks/<Notebook_X>/<file>.py\""
	echo "then commit the updated files. Files that differ:"
	git --no-pager diff --name-only
	exit 1
	fi
	echo "All notebooks are in sync. ✓"

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