Function js_ascii_slug 

pub fn js_ascii_slug(name: &str) -> String

The frontend’s id for a launch with no slug: JavaScript’s name.toLowerCase().replace(/[^a-z0-9-_]/g, "-"). ASCII only, unlike path_slug; no collapsing. The regex has no u flag, so it replaces each UTF-16 code unit: a character outside the BMP becomes two dashes (Agent 🚀 → agent---), which signing-key names depend on (Codex P1 on #3633).