fix: 保留 completed agentMessage 事件 (#56)

Co-authored-by: Codex <codex@pikas.tech>

src/mgr/result.ts

@@ -90,11 +90,14 @@ function messageFromEvents(events: RunEvent[]): string | null {
 }
 
 function assistantReply(events: RunEvent[]): string {
-  return events
-    .filter((event) => event.type === "assistant_message")
+  const assistantEvents = events.filter((event) => event.type === "assistant_message");
+  const authoritative = assistantEvents
+    .filter((event) => event.payload.replyAuthority === true || event.payload.final === true)
     .map((event) => textPayload(event.payload))
-    .filter((text) => text.length > 0)
-    .join("");
+    .filter((text) => text.length > 0);
+  const latestAuthoritative = authoritative.at(-1);
+  if (latestAuthoritative) return latestAuthoritative;
+  return assistantEvents.map((event) => textPayload(event.payload)).filter((text) => text.length > 0).join("");
 }
 
 function textPayload(payload: JsonRecord): string {