Function confirm_core 

pub async fn confirm_core<S: TerminalSetup, E: EventSource>(
    workdir: &Path,
    concern: &WorkdirConcern,
    setup: &mut S,
    events: &mut E,
) -> bool

Put the question on screen and wait for an answer.

Generic over the same crate::tui::TerminalSetup/crate::tui::EventSource seams lev setup uses, so the whole flow runs against a TestBackend with canned keys - the real crossterm pair lives in the binary, where the terminal I/O belongs.

Returns whether to proceed. Anything that is not an explicit yes is a no: Esc, n, a closed event source, or a draw that fails. A confirmation that defaults to yes on an error is not a confirmation.