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demo/ no longer vendors copies of the viewer's index.html/app.css/app.js. The Pages workflow now runs demo/build_demo.py, which builds the site from web/ (the single source of truth) plus demo/summary.json, applying the demo deltas mechanically: static ./summary.json data source, relative asset paths, demo title/heading, synthetic-data banner and footer. Every substitution asserts its anchor matched exactly once, so viewer drift fails the deploy instead of silently publishing a stale or broken demo. The deploy also triggers on web/** changes now. Closes #19
This was referenced Jul 22, 2026
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Closes #19
Summary
demo/index.html,demo/app.css,demo/app.js— the drift risk flagged in issue Deploy a demo site with dummy-account data to GitHub Pages #15's design and PR Deploy static demo site with synthetic data to GitHub Pages #16.demo/build_demo.py: builds the demo site fromweb/(now the single source of truth) +demo/summary.json, mechanically applying the demo deltas (static./summary.jsonfetch, relative asset paths, demo title/heading, synthetic-data banner/footer). Each substitution asserts its anchor text matched exactly once — ifweb/evolves in a way the transform doesn't understand, the deploy fails loudly rather than shipping a broken demo._site/instead ofdemo/, and now also triggers onweb/**so viewer changes redeploy the demo automatically.Testing
web/app.jsfails the build with a clear assertion pointing at the drifted anchor; restoring it builds clean._site/is gitignored so local builds can't be committed accidentally.