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Metadata tracked per message id. Surfaced to applications via
useMessageMetadata(stream, messageId).
interface MessageMetadataCheckpoint id the message's parent was at when this message was
observed. Drives fork / edit flows
(submit(input, { forkFrom: { checkpointId } })).
undefined when the message was observed without a paired
checkpoint envelope (e.g. before checkpoints rolled out, or when
the caller stripped them upstream).