A temporary document
This document is deliberately omitted from the sidebar and carries no authored incoming links. The product page still lists it as an ordinary documentation link, so omission from the sidebar is not confidentiality: the page stays routable, exported and discoverable.
Why it exists
Removing this source and rebuilding is how the corpus proves that a removed document takes everything with it. Its three views, its clean Markdown export and its discovery records must all disappear rather than surviving as stale files. Because nothing links to it and no sidebar entry names it, removing it repairs nothing else.