Update data.yml

Author: ericxu68

_data/data.yml

@@ -716,6 +716,16 @@ people:
             photo: "img/people/yongjae_chung.jpg"
             interests: "Systems security, machine learning"
 
+     - &ziyi_xu
+            name: "Ziyi Xu"
+            anchor: ziyi_xu
+            internal: true
+            role: "Master's student"
+            since: 2025
+            photo: "img/people/ziyi_xu.jpg"
+            interests: "Software supply chain security, dependency risk analysis, and intelligent systems"
+
+
     people_cards:
       - type: "Faculty"
         anchor: faculty