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