Zero occurrences in the v0.2 SPEC.md, zero in the v0.1 SPEC.md at the parent of
the migration commit, no reference in upstream's reference_agent source, and one
file in the whole bundle set. An undocumented hand-authored key, legal under
§14's unknown-keys tolerance — a demonstration of the open namespace rather than
a field to support.
The same sweep settles '# Cited by': body prose in two policy files, absent from
the spec, and independently DERIVED by the visualizer (viz.html:56) from sources.
Both fit the upstream pattern already visible in credibility scores and trust
tiers — OKF stores signals, consumers derive views.
Answering this needed the v0.1 spec text, upstream's source, and a whole-tree
grep at once, which is what the local pinned clone made possible. That is U8's
lesson applied rather than restated.