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Merge pull request #75 from lsb11/content/key-facts-2 #31

	name: Edge freshness

	# WHY: from 25 Jul to 9 Oct 2026 public/_headers told Cloudflare's edge to
	# keep HTML for a year, and canonical URLs served content weeks older than
	# the deploy (scripts/lib/edge-freshness.mjs). Crawlers only fetch canonical
	# URLs, so a fix that deployed was not a fix crawlers could see. This asserts,
	# after each deploy and daily, that every sitemap URL serves the current bytes.
	on:
	push:
	branches: [main]
	schedule:
	- cron: '30 7 * * *'
	workflow_dispatch:

	jobs:
	fresh:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-node@v4
	with:
	node-version: '20'
	# On a push the deploy is still building. Pages builds take minutes;
	# keep checking until the edge and the deploy agree, or give up.
	- name: Every sitemap URL serves the current deploy
	run: \|
	if [ "${{ github.event_name }}" != "push" ]; then
	node scripts/edge-freshness.mjs
	exit $?
	fi
	sleep 180
	for attempt in 1 2 3 4 5 6; do
	if node scripts/edge-freshness.mjs; then exit 0; fi
	[ "$attempt" -lt 6 ] && sleep 60
	done
	echo "::error::Canonical URLs still serve stale HTML. Purge Cloudflare's cache (Caching > Configuration > Purge Everything) and look for a Cache Rule."
	exit 1