Feed the built pages through an HTML validator and clean up what it reports.

Audit Checklist

• Extra </div> in the navigation partial: the div that wrapped the recursive sub-menu output sat directly inside <ul class="sub-menu">, turning every submenu entry into an li under a div.
• Trailing slashes on void elements (<link/>, <source/>, <img/>, <br/>) left alone. They come from Hugo’s own templates and from long-standing content, they are valid HTML5, and the stylistic void-style rule stays off.
• Render code block extra attributes (id, tabindex) kept: they drive the copy-to-clipboard button and keyboard scrolling.
• No article element wraps page content.
• Author dates use dateFormat in the datetime attribute and dateFormatHuman for display.

What The Validator Caught

• Kanban summary tables sitting inside a ul (_partials/kanban/kanban-list-short.html).
• li under div from the recursive nav partial: 7,074 reports.
• div inside tbody from _partials/recipes/recipe-times.html.
• <thclass=...> and <tdclass=...> from the table render hook, which trimmed the space before class; the link render hook did the same to title, producing <atitle=...> (17 reports).
• The “Image unavailable.” fallback emitted a p inside a paragraph.
• Dashboard section pages embedded whole scratch pages in their cards, nesting main, nav and footer inside the page; they link now.
• Raw markup in content: an unbalanced blockquote in a post, which closed a paragraph in the middle of the page.

Acceptance Criteria

• pnpm run test builds the site and runs html-validate over public/**/*.html with the html-validate:standard preset, exiting non-zero on any report.
• The publish workflow runs pnpm run test:html after hugo build and fails before the Pages artifact is uploaded.
• Hugo’s pagination redirect stubs (public/**/page/*/index.html) are ignored; Hugo writes them with a head and no body.
• The hand-authored CSS fixtures under public/dashboard/raw/ are ignored: the odd markup is the point of those pages, so it is left as written.
• Card listings show .Description, not .Summary, so embedded card text cannot repeat a heading id across one page.