Per-file content-hash versioning on every /static reference, immutable cache
headers on versioned URLs, no-cache on HTML, auto-bumped service worker cache
name with stale-while-revalidate for assets, and a controllerchange listener
that silently reloads the page when a new SW takes control.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
