The machines of a step are the nodes whose placement names its branch (none named is the trunk; an unwatched branch takes the
trunk's nodes); each is asked compose-candidate with the step's candidate key (run-<id>, or <branch>.<revision>) and input true,
and its input is kept under the ask named for it. Not yet called by a run (AS5-3).
Builds: design 47 G §354, §22, A-226, A-243, A-252
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
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