README: settings file, --config, the new tab. ARCHITECTURE.md and CLAUDE.md: prepare() hook, app command-line options, app code layout, WebEngine notes, the moc raw-string pitfall. THIRD_PARTY_NOTICES: Qt WebEngine. Ship config.example.json; the package README explains the set-up. PROGRESS.md and DESIGN.md: phase 3 results and deviations. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>