audit-schema-consumption.md's recurring defect: a key that validates
but does nothing, five separate instances (css/extra.css overlay,
tokens.font_family, tokens.font_fallback, tokens.font_size_base,
tokens.accent_to). All five are consumed only by breadbar/breadbox,
which this pass doesn't touch, so per the audit's own (a)/(b)/(c)
choice this is (b): document the gap at both the schema accessor and
every theme.toml site that sets the key, so the manifest states its
design intent honestly instead of implying the value has an effect it
doesn't.
Also documents modules.clock.format/show_date (consumed only by
ClockStyle::Plain, silently ignored by Flip/None) and
bar.window.margin.bottom (parsed, never applied by breadbar) the same
way.
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