Function run_summaries_for 

pub fn run_summaries_for(
    engine: &Arc<Mutex<SopEngine>>,
    sop_name: Option<&str>,
) -> Result<Vec<SopRunSummary>, Error>

Enumerate every run the engine holds (active + retained terminal), newest first, optionally scoped to one SOP. Errors only if the engine lock is poisoned. This is the Runs surface’s data source.