Full article page built as a plain, fully editable Etch tree: a full-bleed cover hero with the title, meta and dek set over a photo, then a two-column body — a single-column article (five h2 sections of paragraphs, one with a bulleted list) beside a sidebar holding a hand-editable "On This Page" anchor list and an author bio card. Nothing repeats identically enough to warrant a component; every heading, paragraph, link and bio field stays hand-editable in Layers. data-sidebar on the layout (toc|author) chooses which sidebar module leads (the other still renders below it). The sidebar sits above the article on narrow screens and becomes a sticky rail from 56em. Inline IntersectionObserver JS (no library) highlights whichever ToC link matches the section currently in view; without JS every link still works as a plain in-page anchor.