Login on the demo instance is SSO-only, so visitors always arrive as a
fresh user and consume seed content through Explore. Rebuild the seed
around that funnel: four personas (steven the maintainer, alice, ben,
zoe), a public feed mixing short captures with long-form anchors, and
protected memos that visibly appear after sign-in to teach the
visibility model.
Every headline feature is now demonstrated: nested tags, memo
references, comments with mentions, reactions, locations, a database-
stored image attachment, and a rendering test memo covering math,
mermaid, code, tables, and task lists.
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