- Add Workbox-based service worker to cache JS, CSS, and fonts - JS/CSS cached for 30 days, fonts for 1 year - Support for CDN assets via ASSET_CDN_HOST - Version-based cache invalidation on deployments - Automatic cache cleanup for old versions - Build service worker during asset precompilation Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>