ci: add check + Remotion smoke-render workflow #1

	name: CI

	# What this proves: the syntax gate passes and the Remotion render pipeline
	# reproduces from the committed walkthrough data (src/walkthrough.data.js +
	# public/wt/) alone. What it deliberately excludes: the Playwright capture
	# step (walkthrough.mjs), which needs live localhost apps and cannot run here.

	on:
	pull_request:
	push:
	branches: [main]

	permissions:
	contents: read

	jobs:
	check-and-smoke-render:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-node@v4
	with:
	node-version: "20"
	cache: npm
	- run: npm ci
	- run: npm run check
	- name: Ensure Remotion headless browser
	run: npx remotion browser ensure
	- name: Smoke render (frames 0-30 of a bundled walkthrough)
	run: npx remotion render src/index.js WT-NodeRoom /tmp/wt-smoke.mp4 --frames=0-30 --concurrency=2
	- name: Verify artifact exists and is non-trivial
	run: test -s /tmp/wt-smoke.mp4 && stat -c '%s bytes' /tmp/wt-smoke.mp4

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