The runner hears the builder's stream of build ends (kept last per subject, read whole at its start, A-181: consumes
`mesh-delivery-builder.build.ended.**`) and keeps when each build ended, the stream's own time. wait-held carries it as
`clock-from`, the bound of the wait is armed from it (30 minutes less what passed), and a bound whose build has not ended is armed
when its end is heard, with wait-held said again. A failed end starts no clock.
Builds: design 47 G §266, §269, §703, A-181, A-206
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
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