Mirrors the GitLab pipeline — typecheck, tests, feed sanity — and adds a
Pages deploy.
Pages serves from /<repo>/, and the app used absolute asset paths, so that
job would have shipped a site that 404s on everything. Assets now resolve
against a <base href> the build substitutes, the feed URL resolves against
document.baseURI so deep links work too, and the service worker derives its
paths from its own registration scope. Root-hosted builds are unchanged.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
