6004420620
- Replace scroll event listener with Intersection Observer in TableOfContentsRenderer - Eliminates ~100ms forced reflows from offsetTop reads during scroll - Revert Bootstrap CSS to blocking (media='all') - deferring caused CLS 0.954 - Keep CriticalBootstrapService available for future optimization - Simplify CriticalCSSHooksRegistrar to only use CriticalCSSService 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>