Unknown public URLs now return a real HTTP 404
Unknown public URLs now return a real HTTP 404 instead of HTTP 200. The existing not-found illustration is unchanged. The addition is a For AI agents and crawlers section with links to the sitemap, the llms.txt site index, and the API docs, plus a Markdown version disclosure.

The llms.txt site index lists public pages for language models. On the homepage, features, pricing, and FAQ copy are present in the prerendered HTML without waiting on JavaScript; interactive previews still load in the browser.
Open a path that does not exist and read For AI agents and crawlers, or fetch llms.txt.