Function check_with 

pub fn check_with(
    title: &str,
    body: &str,
    decision: Option<LanguageDecision>,
) -> Vec<Violation>

check with an optional decision from judge_language.

A decision replaces the vocabulary heuristics only: “not English” always stands, “English” still has to clear the non-ASCII share floor, so a wrong answer alone cannot put CJK text on GitHub. None is exactly check.