The puller's end of a run carries the run's program's last line of standard output as `output` up to StepEndedInlineMost, else keeps
it with KeepOutput and names the object in `output-object`; a program that exits other than 0 ends failed. OutputTool serves the
seat's verb `output` from the kept object, as the whole file the tool runner sends in chunks; OutputsStore names the store.
Builds: design 47 G A-254, A-257, §602
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
