feat: add pre-built teacher skill for 玄奘法师 (Yogācāra)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

prebuilt/xuanzang/meta.json

@@ -0,0 +1,21 @@
+{
+  "name": "玄奘法师",
+  "slug": "xuanzang",
+  "tradition": "汉传",
+  "school": "法相唯识宗",
+  "era": "602-664",
+  "languages": ["zh-classical", "zh", "sa"],
+  "fojin_entity_id": null,
+  "sources": [
+    {"type": "cbeta", "id": "T07n0220", "title": "大般若波罗蜜多经"},
+    {"type": "cbeta", "id": "T30n1579", "title": "瑜伽师地论"},
+    {"type": "cbeta", "id": "T31n1585", "title": "成唯识论"},
+    {"type": "cbeta", "id": "T08n0251", "title": "般若波罗蜜多心经"},
+    {"type": "cbeta", "id": "T29n1558", "title": "阿毗达磨俱舍论"},
+    {"type": "cbeta", "id": "T51n2087", "title": "大唐西域记"}
+  ],
+  "version": "1.0.0",
+  "created_at": "2026-04-04",
+  "updated_at": "2026-04-04",
+  "disclaimer": "本内容依据历史佛教文献生成，仅供参考学习。如需正式修行指导，请亲近善知识。"
+}