Function wrap_script_class 

pub fn wrap_script_class(
    lang: Option<&str>,
    default: ScriptClass,
) -> ScriptClass

Resolve the script class to realize semantic wrap punctuation as.

Per-item script evidence only overrides the style-declared default when that default is ScriptClass::Cjk — i.e. the style has opted in via options.multilingual.realization-default: cjk. A style that has not opted in (default is ScriptClass::Latin, which includes every existing style today) realizes Latin wrap punctuation unconditionally, regardless of the item’s language.

This gate exists because raw item language is not the same as the item’s rendered script: a style can romanize a non-Latin source (e.g. Chicago’s “romanized + original-script [translation]” mode for East Asian references) so the citation displays as Latin-script prose even though the reference’s language is zh/ja/ko. Without the gate, such an item’s CJK language evidence would incorrectly force full-width wrap punctuation onto an otherwise entirely Latin-script citation. See docs/specs/PUNCTUATION_REALIZATION.md §5.