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  The root plus the prerendered documents — the only URLs here that are
  content and return 200. The app routes (/detail, /diary, /scoreboard,
  /settings) are app state: they render from the visitor's own diary, serve the
  same HTML through the SPA 404 shim, and GitHub Pages returns them with a 404
  status. They canonicalise to the root instead. The /pollen and /glossary
  pages are content and carry their own canonical tags.

  The glossary is thirteen of those: an index and a page per thing in the air,
  one per question a person types (specs/36-glossary-pages.md). They are listed
  in the air table's order rather than alphabetically, which is the order the
  pages link each other in. A slug lives in src/content/glossary.ts, so a
  rename shows up here as a URL that no longer matches a page.
-->
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