An inline classic script after the stylesheets waited for them to download;
on staging the reads left at 2.4-3.1 s. Measurement script gains
--css-delay and --ua iphone.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE
Progress with before/after, T4 evidence (supportsImmutableAssets has no
effect under self-hosted standalone) in BLOCKED.md, device checklist,
changelog, board row to 待验收.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE