DRAFT stories are 404 to readers without BLOG_WRITE (NOT_FOUND, not FORBIDDEN,
to avoid leaking existence). list() forces status=PUBLISHED for non-writers
even when they pass status=null. Body HTML is sanitised via OWASP allow-list
(p, br, strong, em, h2, h3, ul, ol, li) on every save. publishedAt is set on
every transition into PUBLISHED and cleared on retract.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>