feat: add pre-built teacher skill for 法藏大师 (Huayan)

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

prebuilt/fazang/meta.json

@@ -0,0 +1,20 @@
+{
+  "name": "法藏大师",
+  "slug": "fazang",
+  "tradition": "汉传",
+  "school": "华严宗",
+  "era": "643-712",
+  "languages": ["zh-classical", "zh"],
+  "fojin_entity_id": null,
+  "sources": [
+    {"type": "cbeta", "id": "T10n0279", "title": "大方广佛华严经(八十华严)"},
+    {"type": "cbeta", "id": "T35n1733", "title": "华严经探玄记"},
+    {"type": "cbeta", "id": "T45n1866", "title": "华严一乘教义分齐章"},
+    {"type": "cbeta", "id": "T45n1875", "title": "华严经义海百门"},
+    {"type": "cbeta", "id": "T45n1876", "title": "修华严奥旨妄尽还源观"}
+  ],
+  "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。"
+}