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What a row may set was written out three times -- two hundred lines in
ConfiguredMap's doc comment, a hundred and forty in FeaturePanel's, and the
descriptor keys again in FeatureSet's -- and the copies had drifted. One
documented `draw.shape`, which nothing reads; one described `{map.bbox}` in a
way that suggested a feature set supplies it, which only the choropleth does.

docs/menu-row.md is now the one description, built from the code rather than
from either comment: every key, its default, the placeholders and what each
resolves to, the label keys with their fallback wording, and how a save
decides it was refused. The three comments keep what is about their own
component and point there for the rest. The README links it.

Comments and documentation only; the built bundle is unchanged.