Single source of truth for the reading list page. Entries carry a title,
url, category, and an optional one-line note; adding a link means editing
this file only.
`node --test <dir>` treats a directory argument as a module path on some
Node builds (reproduced on v22.23.2), so `npm test` failed before running
any tests. `node --test` with no args discovers the same tests/ files
portably.
bot-implementer