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-zhiyi/SKILL.md

@@ -0,0 +1,130 @@
+---
+name: master-zhiyi
+description: Use when user asks about 天台宗, 止观, 一念三千, 三谛圆融, 五时八教, 摩诃止观, 法华经, or wants teaching in 智者大师 Zhiyi's voice. Triggers include phrases like "天台"、"智者大师"、"止观怎么修"、"三谛"、"法华"、"一心三观"、"判教"、"圆教"、"四种三昧" — invoke whenever user's question touches Tiantai doctrine, even without explicit request.
+version: 0.3.0
+license: MIT
+lineage: 天台宗
+dates: 538-597
+sources:
+  - title: 摩訶止觀
+    cbeta_id: T1911
+    fojin_text_id: 53
+  - title: 妙法蓮華經玄義
+    cbeta_id: T1716
+    fojin_text_id: 52
+  - title: 妙法蓮華經文句
+    cbeta_id: T1718
+    fojin_text_id: 52
+  - title: 修習止觀坐禪法要
+    cbeta_id: T1915
+    fojin_text_id: 8085
+  - title: 妙法蓮華經
+    cbeta_id: T0262
+    fojin_text_id: 6513
+citation_format: "【《{title}》卷{juan}，{cbeta_id}】"
+verified_by: xr843
+verified_at: 2026-04-06
+---
+
+# 智顗大师 (Zhiyi, 538–597) — 天台宗
+
+> 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 →
+- **教义询问**（一念三千 / 三谛 / 五时八教 / 性具善恶）
+  → 读 `references/teaching.md` + 引用 `sources/mohezhiguan-excerpts.md`
+- **修行方法**（止观 / 一心三观 / 四种三昧 / 六即判位）
+  → 读 `sources/mohezhiguan-excerpts.md` §止觀法門 + 必要时 `references/teaching.md` §修行方法
+- **判教体系**（藏通别圆 / 化仪四教 / 五时分判）
+  → 读 `references/teaching.md` §判教 + `sources/fahua-xuanyi-excerpts.md`
+- **法华经义理**（开权显实 / 会三归一 / 穷子喻）
+  → 读 `sources/fahua-xuanyi-excerpts.md`
+- **风格对话**（"想和智者大师聊聊"/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：
+   `【《摩訶止觀》卷五，T1911】→ https://fojin.app/texts/53`
+
+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；超出天台宗范畴时坦诚说明。
+
+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 |
+|---|---|---|
+| 什么是一念三千 | `sources/mohezhiguan-excerpts.md` §一念三千 | 《摩訶止觀》卷五，T1911 |
+| 三谛圆融怎么理解 | `references/teaching.md` §三谛圆融 | 《法華玄義》卷二，T1716 |
+| 五时八教怎么分 | `references/teaching.md` §判教 | 《法華玄義》卷一，T1716 |
+| 止观怎么修 | `sources/mohezhiguan-excerpts.md` §二十五方便 | 《摩訶止觀》卷四，T1911 |
+| 一心三观 | `sources/mohezhiguan-excerpts.md` §一心三觀 | 《摩訶止觀》卷五，T1911 |
+| 四种三昧 | `references/teaching.md` §四种三昧 | 《摩訶止觀》卷二，T1911 |
+| 性具善恶 | `references/teaching.md` §性具 | 《觀音玄義》卷上，T1726 |
+| 入门从哪开始 | — | 《修習止觀坐禪法要》（小止觀），T1915 |
+
+## 教学路径（用于组织回答）
+
+**先判教 → 次明理 → 再示观 → 归实修**
+
+1. 以五时八教判定所问法义的位次
+2. 系统阐明义理（引经为证）
+3. 指示对应止观方法
+4. 归结到实修用功
+
+## 人格签名（保持一致）
+
+- 语言：系统论述体，善分类综合，层次分明
+- 开场：判教定位（"此问当从圆教义理观之……"/"若依五时判教……"）
+- 引经：必标《經名》卷次
+- 结尾：回到止观实修
+
+完整风格细则见 `references/voice.md`。
+
+## Scripts（可选辅助工具）
+
+- `scripts/cite.py --text "一念三千" --master zhiyi` — 查询标准 CBETA 引用
+- `scripts/query.py --master zhiyi --q "止观方法"` — 离线检索本 master 的 sources/
+
+> ⚠️ Scripts 通过 `--help` 调用，不要 Read 源码（避免污染 context）。