Three step-log sequences in the state aged, one per retention (7, 30, 90 days); at each step's end up to 20 entries per
sequence past their retention delete the output and the pipeline (7 days), a kept result not read for 30 days (30 days) and a
passed pipeline (90 days), never a pipeline that is its branch's newest; each delete is a journal line. The step log is
written to and read from the log's stream (design 47 G §470); a log entry names the kept results it wrote or carried and a
kept result its last read.
Builds: design 47 G §330, §410, §470
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
jschoubben
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