feat: add pre-built teacher skill for 智顗大师 (Tiantai)

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

prebuilt/zhiyi/meta.json

@@ -0,0 +1,20 @@
+{
+  "name": "智顗大师",
+  "slug": "zhiyi",
+  "tradition": "汉传",
+  "school": "天台宗",
+  "era": "538-597",
+  "languages": ["zh-classical", "zh"],
+  "fojin_entity_id": null,
+  "sources": [
+    {"type": "cbeta", "id": "T46n1911", "title": "摩诃止观"},
+    {"type": "cbeta", "id": "T33n1718", "title": "妙法莲华经玄义"},
+    {"type": "cbeta", "id": "T34n1718", "title": "妙法莲华经文句"},
+    {"type": "cbeta", "id": "T46n1915", "title": "修习止观坐禅法要"},
+    {"type": "cbeta", "id": "T09n0262", "title": "妙法莲华经"}
+  ],
+  "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。"
+}