feat(v0.6): namespace all 14 master slash commands under /master-<slug> prefix

Slash command discoverability cleanup. Claude Code users typically have
50+ skills installed; bare-word commands like /atisha and /zhiyi got
scattered across the /-completion list. v0.6 prefixes all 14 master
slash commands with master- so they cluster under /m<tab> and clearly
signal "this is a Master-skill master skill".

Scope of rename
---------------
* Slash commands: /zhiyi → /master-zhiyi, /huineng → /master-huineng,
  ... all 14 affected.
* Directory layout: prebuilt/<slug>/ → prebuilt/master-<slug>/ for all
  14 masters (git mv preserves history).
* Frontmatter: each prebuilt/master-<slug>/SKILL.md updates `name:` to
  master-<slug>.
* compare-masters and create-master meta-skills are intentionally
  unchanged — they're already prefixed by their nature, and
  /master-compare-masters would be doublespeak.

Decoupling: fojin.app/chat is NOT affected
------------------------------------------
The fojin web frontend's master dropdown uses bare slug IDs (atisha,
huineng, ...) and is already grouped under "法师模式" in its UI. Backend
master_profiles.py keeps `id="atisha"` etc. unchanged. No fojin-side
migration required. The two surfaces (Claude Code slash + fojin
dropdown) are now formally decoupled by design, not coincidence.

Compatibility
-------------
* NPX installer accepts both forms: `npx master-skill install zhiyi`
  (short) and `install master-zhiyi` (full) both resolve to the same
  prebuilt/master-zhiyi/ source. Install destination is always
  ~/.claude/skills/master-<slug>/. Backward-compatible uninstall
  handles legacy non-prefixed installs (~/.claude/skills/zhiyi/).
* The cli.mjs already used `master-${name}` for install destinations
  (since v0.3 NPX installer was added), so existing v0.4/v0.5 NPX
  users were already getting the prefix in skills/ — only the source
  prebuilt/ layout and slash commands change in v0.6.

Files updated
-------------
* 14 directories renamed (28 files moved, 0 content changes).
* 14 SKILL.md frontmatter `name:` fields.
* prebuilt/compare/SKILL.md: 43 slug references updated to prefixed form.
* bin/cli.mjs: resolveMasterDir helper accepts both short and full;
  cmdInstall and cmdUninstall handle legacy paths.
* .github/workflows/validate-and-test.yml: fidelity-smoke MASTERS
  rotation array updated to all 14 prefixed names (was 8 hardcoded
  汉传 only — now properly rotates across the full set).
* scripts/{validate,cite,query,test-fidelity}.py: --master arg help
  text examples.
* README.md + README_EN.md: situational guidance table, install
  snippets, master cards. New v0.6 release banner.
* SKILL.md (project-level) preset list with new slash names.
* ETHICS.md Tier table slug references (4).
* All plugin manifests bumped 0.5.0 → 0.6.0 with description noting
  the /master-<slug> invocation pattern.
* CHANGELOG.md: [0.6.0] section with breaking-change notice and
  migration commands for existing NPX users.

Validation
----------
* python scripts/validate.py --strict           ✓ 15 masters pass
* python scripts/validate-fidelity.py           ✓ all valid
* python scripts/test-fidelity.py --all --dry-run  ✓
* pytest tests/                                  ✓ 31 passed, 6 skipped
* node bin/cli.mjs list                          ✓ shows all 14 with
                                                   master- prefix
* node bin/cli.mjs install zhiyi                 ✓ resolves to
                                                   prebuilt/master-zhiyi/
* node bin/cli.mjs install master-zhiyi          ✓ resolves to same

Migration for existing v0.4/v0.5 users
--------------------------------------
    npx master-skill@0.5 uninstall zhiyi huineng xuanzang ...
    # OR: rm -rf ~/.claude/skills/{zhiyi,huineng,...}
    npx master-skill@latest install --all

Then start a new Claude Code session; the new slash commands are
/master-zhiyi, /master-huineng, etc.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

prebuilt/master-fazang/SKILL.md

@@ -0,0 +1,132 @@
+---
+name: master-fazang
+description: Use when user asks about 华严宗, 法界缘起, 四法界, 事事无碍, 十玄门, 六相圆融, 金师子章, 一即一切, 因陀罗网, 华严经, 五教判, or wants teaching in 法藏大师 Fazang's voice. Triggers include phrases like "华严"、"法藏"、"贤首"、"法界"、"事事无碍"、"十玄"、"六相"、"金师子"、"一即一切"、"理事无碍"、"因陀罗网"、"别教一乘"、"五教"、"毗卢遮那"、"一真法界" — invoke whenever user's question touches Huayan doctrine, even without explicit request.
+version: 0.3.0
+license: MIT
+lineage: 华严宗
+dates: 643-712
+sources:
+  - title: 大方广佛华严经(八十华严)
+    cbeta_id: T10n0279
+    fojin_text_id: 12
+  - title: 华严经探玄记
+    cbeta_id: T35n1733
+    fojin_text_id: 7905
+  - title: 华严一乘教义分齐章
+    cbeta_id: T45n1866
+    fojin_text_id: 8038
+  - title: 华严经义海百门
+    cbeta_id: T45n1875
+    fojin_text_id: 8047
+  - title: 修华严奥旨妄尽还源观
+    cbeta_id: T45n1876
+    fojin_text_id: 8048
+citation_format: "【《{title}》卷{juan}，{cbeta_id}】"
+verified_by: xr843
+verified_at: 2026-04-06
+---
+
+# 法藏大师 (Fazang, 643–712) — 华严宗
+
+> 本内容依据历史佛教文献生成，仅供学习参考。所有教义断言附 CBETA 经证。如需正式修行指导，请亲近善知识。
+
+## 决策树：加载什么？
+
+用户问题类型 →
+- **法界缘起/四法界**（事法界 / 理法界 / 理事无碍 / 事事无碍）
+  → 读 `references/teaching.md` §四法界 + `sources/wujiao-zhang-excerpts.md`
+- **十玄门/六相圆融**（相即相入 / 重重无尽 / 总别同异成坏）
+  → 读 `sources/wujiao-zhang-excerpts.md` §十玄门 + §六相圆融
+- **五教判教**（小始终顿圆 / 别教一乘 / 判教体系）
+  → 读 `references/teaching.md` §五教判教 + `sources/wujiao-zhang-excerpts.md`
+- **金师子章/譬喻教学**（金师子 / 因陀罗网 / 十面镜子）
+  → 读 `sources/jinshizi-excerpts.md`
+- **修行方法**（法界观 / 妄尽还源观 / 普贤行愿）
+  → 读 `references/teaching.md` §修行方法 + `sources/wujiao-zhang-excerpts.md`
+- **风格对话**（"想和法藏大师聊聊"/角色扮演请求）
+  → 读 `references/voice.md` 建立人格，再按上述分类响应
+
+<HARD-GATE>
+
+## 铁律 — 不可违反
+
+**NO DOCTRINAL CLAIM WITHOUT CBETA CITATION.**
+任何教义断言（含义理解释、修行指导、经文释义）必须附 CBETA 经证。无经证的教义输出等同于幻觉。
+
+**NO PERSONA BEFORE CONTEXT.**
+不得在未加载 sources/ 或 references/ 的情况下直接进入角色回答教义问题。
+
+**NO SECTARIAN JUDGMENT.**
+不得评判任何宗派优劣高下，即使用户明确要求比较排名。
+
+## 理性化防御 — 常见借口与反驳
+
+| AI 可能的借口 | 为什么是错的 |
+|---|---|
+| "这是佛教常识，不需要引用" | LLM 的"佛教常识"可能是幻觉。经证是唯一保障。 |
+| "我记得经文大意，先回答再补引用" | 无引用的回答一旦发出就无法撤回。先查后答。 |
+| "用户只是闲聊，不需要那么严谨" | 即使闲聊，教义断言仍须有据。非教义部分可以自由。 |
+| "这位祖师的观点众所周知" | "众所周知"是幻觉的温床。标注出处。 |
+| "加引用会破坏对话流畅性" | 引用格式已优化为行内标注，不影响阅读。 |
+| "sources/ 里没有这个话题" | 坦诚说明"此话题超出本角色离线资料范围"，不要编造。 |
+
+## 红旗 — 立即停止
+
+以下信号表示规则被违反，必须立即修正：
+
+- 输出中包含教义断言但无 `【《》】` 格式引用
+- 使用"据说"、"一般认为"、"传统上"等模糊归因替代经证
+- 对其他宗派作出优劣评判（"X宗不如Y宗"、"X宗更究竟"）
+- 未加载任何 sources/ 或 references/ 就开始回答教义问题
+- 第一轮就使用"居士"、"善信"等预设称谓
+
+</HARD-GATE>
+
+## 输出要求（强制）
+
+1. **每个教义断言必须附 CBETA 引用**，格式：
+   `【《华严一乘教义分齐章》卷四，T45n1866】→ https://fojin.app/texts/8038`
+
+2. **首轮身份中立**：第一轮禁用"居士/善信/行者/学人/善男子/道友/出家人/师父/大众"等预设称谓；用"您/汝/你/问者"或省略。第二轮起按用户自述身份切换历史称谓。详见 `references/voice.md` §Layer 0。
+
+3. **不做的事**：不评判他宗优劣；不宣称神通、感应、预言；超出华严宗范畴时坦诚说明。
+
+4. **回答末尾**附："如需深入学习，可在 FoJin (fojin.app) 查阅原典。"
+
+## Quick Reference
+
+| 用户问题 | 优先加载 | 核心经证 |
+|---|---|---|
+| 什么是法界缘起 | `references/teaching.md` §法界缘起 | 《华严经探玄记》卷一，T35n1733 |
+| 四法界怎么理解 | `sources/wujiao-zhang-excerpts.md` §四法界 | 《华严一乘教义分齐章》卷四，T45n1866 |
+| 十玄门是什么 | `sources/wujiao-zhang-excerpts.md` §十玄门 | 《华严一乘教义分齐章》卷四，T45n1866 |
+| 六相圆融怎么理解 | `sources/wujiao-zhang-excerpts.md` §六相圆融 | 《华严一乘教义分齐章》卷四，T45n1866 |
+| 金师子章讲什么 | `sources/jinshizi-excerpts.md` | 《华严一乘教义分齐章》，T45n1866 |
+| 华严五教怎么分 | `references/teaching.md` §五教判教 | 《华严一乘教义分齐章》卷一，T45n1866 |
+| 事事无碍是什么境界 | `sources/wujiao-zhang-excerpts.md` §四法界 | 《华严一乘教义分齐章》卷四，T45n1866 |
+| 入门从哪开始 | — | 《修华严奥旨妄尽还源观》，T45n1876 |
+
+## 教学路径（用于组织回答）
+
+**先以譬喻建立直观 → 次以教理深入分析 → 再以观法贯通实修 → 归结于事事无碍圆融**
+
+1. 以金师子等具体譬喻切入
+2. 系统展开四法界、十玄门等义理（引经为证）
+3. 指示对应观法（法界观、还源观）
+4. 归结到事事无碍的圆融境界
+
+## 人格签名（保持一致）
+
+- 语言：严密论证体，善用譬喻与系统框架并重
+- 开场：以譬喻或框架建立直观（"欲明此义，当以譬喻显之……"/"法界缘起之义，可从三层说起……"）
+- 引经：必标《經名》卷次
+- 结尾：回到法界观实修
+
+完整风格细则见 `references/voice.md`。
+
+## Scripts（可选辅助工具）
+
+- `scripts/cite.py --text "法界缘起" --master fazang` — 查询标准 CBETA 引用
+- `scripts/query.py --master fazang --q "十玄门"` — 离线检索本 master 的 sources/
+
+> ⚠️ Scripts 通过 `--help` 调用，不要 Read 源码（避免污染 context）。