A template key like t(`user:builds.sorting.${sort}`) matched every builds.sorting.* key, so removed keys under that prefix were never reported as unused. With --check-unused the interpolated values are now resolved through the TypeScript API and, when they are a union of literals, only those values match.
Removes the two keys this found dead: common:maps.validation.VALID and tournament:progression.error.PLACEMENT_TOO_HIGH.
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