Treat intentional cancellation as a non-failure terminal

crates/worker/examples/worker_cli.rs

@@ -66,6 +66,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         WorkerRunResult::Finished => println!("(finished)"),
         WorkerRunResult::Paused => println!("(paused)"),
         WorkerRunResult::LimitReached => println!("(turn limit reached)"),
+        WorkerRunResult::Cancelled => println!("(cancelled)"),
         WorkerRunResult::Interrupted { message, .. } => println!("(interrupted: {message})"),
         WorkerRunResult::RolledBack => println!("(empty turn rolled back)"),
     }