Function tasks_visible 

pub fn tasks_visible(
    store: &TaskStore,
    turn: &TurnState,
    collapsed: bool,
    attached: bool,
) -> bool

Whether the checklist band renders at all: there must be something to show, and a fully-green list retires once the run goes idle (finished work stays visible only while unfinished work remains). Collapsed with no status widget above (attached false) renders nothing — the state persists and the one-liner reappears when the next run starts.