Function render_ticket_ready 

pub fn render_ticket_ready(
    ready: &[TicketRow<'_>],
    deferred: &[TicketRow<'_>],
    include_deferred: bool,
) -> String

Render the kranz ticket ready table: the ready rows in the same shape as render_ticket_list, then — only when include_deferred asked for it — a second table of the not-yet-ready deferred tickets with their defer times (D-BW-3: operator visibility without polluting the default listing).