feat: add privacy-safe server diagnostics

control-plane/test/agentbus.test.ts

@@ -770,7 +770,12 @@ test('WeChat attachment placeholder without file metadata fails closed before ta
     '附件内容未传到平台，原任务仍在等待附件。请检查微信桥接器的文件转发后重新发送。'
   );
   assert.ok(logs.some((entry) => entry.metadata.agentbus_event === 'task_processing_failed'
-    && entry.metadata.error_code === 'roster_attachment_metadata_missing'));
+    && entry.metadata.error_code === 'roster_attachment_metadata_missing'
+    && /^[a-f0-9]{24}$/u.test(String(entry.metadata.error_fingerprint))));
+  assert.ok(logs.some((entry) => entry.metadata.agentbus_event === 'task_processing_started'
+    && entry.metadata.attachment_count === 0
+    && entry.metadata.attachment_placeholder === true));
+  assert.ok(logs.some((entry) => entry.metadata.agentbus_event === 'attachment_metadata_missing'));
   assert.ok(logs.some((entry) => entry.metadata.agentbus_event === 'outbound_result_sent'));
 });