Four lines he hears out loud lived as string literals in three Go files, so
rewording one meant a rebuild. They move to fallbacks_ru_v1.json on the shape
nudges_ru_v1.json already uses: embedded, schema-versioned, several variants,
never the same one twice running.
The gap phrase is marked fixed, because it names one specific missing model and
must not drift into a general "I do not know". Every accessor falls back to the
literal it replaced, including on a nil receiver: these strings exist because
something already failed, so a broken template file must not take her last
words away.
