A message delivered again in the same run keeps its kept time; after a restart, which kept none, it takes the time
the bus stored it, never later than its first delivery, so a message that never settles grows old and the runner's
health check fires for it.
Builds: design 47 G A-187, §76
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
process.ConsumerLedger writes stream, name, acknowledged sequence, pending, last event applied with its at and the delivery of
the oldest unacknowledged message into one key per consumer, after each message delivered and applied, so a tool reads them.
Builds: design 47 G §579, A-166, A-176
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
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