A fully-loaded artifact + its version to render as a card under a message.
A single message can carry more than one DISTINCT artifact (e.g. a research
report plus a standalone generated infographic), so the message renders an
array of these — one card each.
A fully-loaded artifact + its version to render as a card under a message. A single message can carry more than one DISTINCT artifact (e.g. a research report plus a standalone generated infographic), so the message renders an array of these — one card each.