fix: treat human-interrupted paired runs as preempted

src/message-close-reasons.ts

@@ -0,0 +1,7 @@
+export const HUMAN_MESSAGE_DETECTED_CLOSE_REASON = 'human-message-detected';
+
+export function isHumanMessageCloseReason(
+  reason: string | null | undefined,
+): boolean {
+  return reason === HUMAN_MESSAGE_DETECTED_CLOSE_REASON;
+}