Function agenda_items 

pub(crate) fn agenda_items(
    from: i64,
    to: i64,
    removed: &BTreeSet<PathBuf>,
    skipped: &BTreeSet<(PathBuf, i64)>,
    tasks: &[Task],
) -> Vec<Occurrence>

What every agenda shows from from to to (Unix seconds), the window’s, the phone’s and the home card alike (21 October 2026): the calendars’ events, those whose deletion waits (“Undo”) aside, a task’s time block marked as the task it is, with its list (agenda::mark_tasks).