headings_demo: https://gpt-5-2-memory-improvement-45419d.gitlab.io/channel-hub/headings-demo.html
headings_article: https://gpt-5-2-memory-improvement-45419d.gitlab.io/channel-hub/article-headings.html
headings_os_receipts: https://gpt-5-2-memory-improvement-45419d.gitlab.io/receipts/pages/2026-09-07_headings_os_screenshots_2026-09-07T213735Z/