Function execute_thunks_active 

pub fn execute_thunks_active(
    schedule: &ThunkSchedule,
    _arena_buf: &mut [u8],
    _actual: usize,
    _upper: usize,
) -> bool

Active-extent execution stub. The runtime calls this when it has an active-extent hint set. CPU doesn’t implement per-thunk active-extent scaling yet — return false so the caller falls back to the full execute_thunks path.