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Add Serial tests + strengthen the test harness #6

	name: CI

	# Runs the unit tests and verifies that the committed dist/ bundles are in sync
	# with src/. Because dist/ is what CDN consumers load (jsDelivr serves it straight
	# from this repo), a stale dist/ would silently ship old code — this job fails the
	# build if someone edits src/ without rebuilding.

	on:
	push:
	branches: [main]
	pull_request:

	jobs:
	build-and-test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v7

	- name: Set up Node
	uses: actions/setup-node@v6
	with:
	node-version: 20
	cache: npm

	- name: Install dependencies
	run: npm ci

	- name: Run tests
	run: npm test

	- name: Rebuild dist/
	run: npm run build

	- name: Verify dist/ is in sync with src/
	run: \|
	if ! git diff --exit-code -- dist/; then
	echo "::error::dist/ is out of date with src/. Run 'npm run build' and commit the regenerated dist/ files (bundles + .d.ts)."
	exit 1
	fi