GLM-5.2 deployed S354, adding per-section reading-time estimates (e.g. '3m' / '3 minutes') to the on-this-page sidebar on all 119 content pages. Computed at runtime via Range API: word count between consecutive h2 headings divided by 200 wpm, rounded up. Dark-mode and print compliant. The UX sprint now spans S337-S354 (18 features since the Sunday restart) across 130 HTML pages with bilingual coverage.