refactor: rename Buddha-skill → Master-skill

Matches internal architecture (create-master, master_xuanzang, etc.)
and accurately reflects content (historical Chinese Buddhist masters,
not the Buddha himself).

Changes:
- 32 text references across 9 files updated
- Sanskrit terms (buddha-dhātu, buddhatā) preserved in dictionary context
- GitHub repo renamed (preserves stars/forks/history, auto-redirects)
- Internal naming already uses master_* (unchanged)

All 79 tests pass.

README.md

@@ -1,4 +1,4 @@
-# Buddha-skill
+# Master-skill
 
 基于佛教经典文献的法师教学角色生成器，遵循 AgentSkills 标准，由 [FoJin](https://fojin.app) 驱动。
 
@@ -28,8 +28,8 @@
 **Claude Code**
 
 ```bash
-git clone https://github.com/xr843/Buddha-skill ~/Buddha-skill
-cd ~/Buddha-skill && pip install -r requirements.txt
+git clone https://github.com/xr843/Master-skill ~/Master-skill
+cd ~/Master-skill && pip install -r requirements.txt
 # 注册 skills（符号链接到 ~/.claude/skills/）
 for d in prebuilt/*/; do ln -sf "$(pwd)/$d" ~/.claude/skills/"$(basename $d)"; done
 ln -sf "$(pwd)" ~/.claude/skills/create-master
@@ -38,15 +38,15 @@ ln -sf "$(pwd)" ~/.claude/skills/create-master
 **OpenClaw**
 
 ```bash
-git clone https://github.com/xr843/Buddha-skill ~/.openclaw/workspace/skills/create-master
+git clone https://github.com/xr843/Master-skill ~/.openclaw/workspace/skills/create-master
 cd ~/.openclaw/workspace/skills/create-master && pip install -r requirements.txt
 ```
 
 **手动安装**
 
 ```bash
-git clone https://github.com/xr843/Buddha-skill
-cd Buddha-skill && pip install -r requirements.txt
+git clone https://github.com/xr843/Master-skill
+cd Master-skill && pip install -r requirements.txt
 ```
 
 ### 使用预置法师
@@ -196,7 +196,7 @@ SKILL.md (AgentSkills 入口)
 
 [FoJin](https://fojin.app) 是一个佛教文本聚合平台，整合了 503 个数据源、10K+ 篇文本、678K+ 条语义向量嵌入，以及涵盖 31K 实体的知识图谱，覆盖 CBETA 汉文大藏经、SuttaCentral 巴利藏及英译、84000 藏经英译等主要语料库。
 
-Buddha-skill 通过 `tools/fojin_bridge.py` 接入 FoJin API，实现：
+Master-skill 通过 `tools/fojin_bridge.py` 接入 FoJin API，实现：
 
 - 知识图谱实体检索（法师生平、师承、宗派）
 - 语义向量相似度搜索（教义相关经文）