Function is_task_runnable_detailed 

pub fn is_task_runnable_detailed(
    task: &Task,
    active: &QueueFile,
    done: Option<&QueueFile>,
    now_rfc3339: &str,
    include_draft: bool,
) -> Result<(bool, Vec<NotRunnableReason>)>

Check if a specific task is runnable (convenience wrapper).