An http middleware sets 'Server: pagerite' (dropping uvicorn's versioned
default) and content pages return Last-Modified from Node.modified. In
markdown, a {dates} line expands to the article's published/updated
dateline (updated shown only when it falls on a later day); the editor
preview resolves it for pages that exist, unsaved pages show it literal.
Demonstrated in the long-read seed page.
LeoVasanko
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