Properties
kind
'ephemeral': a flow WITHOUT .persistent() checkpointed only so another replica can
continue it (handover.flows: 'forward'); 'stub': a marker of a conversation that
cannot be forwarded (an async bot.conversation), read by handover.fallback.
expiresAt
shape?
name?
startedAt?
startState?
c.state, when it was plain JSON (fallback: 'restart' re-enters with it).