feat: разворачивание комка plugin-dev — 7 навыков (роутер-реестр)

Эпик роутер-реестр, спека v2 §2, этап 1. Зонтик plugin-dev развёрнут в
7 карточек-навыков + 7 под-узлов #57a..#57g.

- 7 карточек plugin-dev__<навык>.contract.json (agent/command/hook/mcp/
  plugin-structure/plugin-settings/skill-development)
- nodes.yaml: узел #57 → #57a..#57g; keyword-триггеры на plugin-structure;
  ссылка L11 обновлена на plugin-dev:plugin-structure
- зонтик plugin-dev убран (карточка + узел)
- registry-load.test: 109 узлов / 101 active

Регрессия (без 5 pre-existing node:test файлов): 4361 passed, exit 0.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/registry/nodes.yaml

@@ -1245,14 +1245,70 @@ nodes:
     attributes:
       tooling_section: "§4.31 #56"
 
-  - id: "#57"
-    name: "plugin-dev"
-    slug: "plugin-dev"
+  - id: "#57a"
+    name: "agent-development"
+    slug: "plugin-dev:agent-development"
     category: "off-phase"
     subcategory: "authoring-tooling"
     status: "active"
     dormancy_reason: null
-    capabilities: "Плагин для разработки marketplace Claude-плагинов: 8 sub-skills (plugin.json, MCP-интеграция, хуки, документация, публикация) + 3 специализированных агента."
+    capabilities: "Субагент плагина: frontmatter + when-to-use + системный промпт."
+    triggers: []
+    boundaries: []
+    chain_membership: []
+    attributes:
+      tooling_section: "§4.32 #57"
+
+  - id: "#57b"
+    name: "command-development"
+    slug: "plugin-dev:command-development"
+    category: "off-phase"
+    subcategory: "authoring-tooling"
+    status: "active"
+    dormancy_reason: null
+    capabilities: "Слэш-команда плагина: YAML-frontmatter + аргументы + bash."
+    triggers: []
+    boundaries: []
+    chain_membership: []
+    attributes:
+      tooling_section: "§4.32 #57"
+
+  - id: "#57c"
+    name: "hook-development"
+    slug: "plugin-dev:hook-development"
+    category: "off-phase"
+    subcategory: "authoring-tooling"
+    status: "active"
+    dormancy_reason: null
+    capabilities: "Хук плагина: событие (PreToolUse/PostToolUse/...) + matcher + скрипт ${CLAUDE_PLUGIN_ROOT}."
+    triggers: []
+    boundaries: []
+    chain_membership: []
+    attributes:
+      tooling_section: "§4.32 #57"
+
+  - id: "#57d"
+    name: "mcp-integration"
+    slug: "plugin-dev:mcp-integration"
+    category: "off-phase"
+    subcategory: "authoring-tooling"
+    status: "active"
+    dormancy_reason: null
+    capabilities: "MCP-сервер в плагине: .mcp.json (stdio/SSE/HTTP)."
+    triggers: []
+    boundaries: []
+    chain_membership: []
+    attributes:
+      tooling_section: "§4.32 #57"
+
+  - id: "#57e"
+    name: "plugin-structure"
+    slug: "plugin-dev:plugin-structure"
+    category: "off-phase"
+    subcategory: "authoring-tooling"
+    status: "active"
+    dormancy_reason: null
+    capabilities: "Структура плагина: plugin.json + раскладка компонентов. Входная точка разработки Claude-плагина."
     triggers:
       - {keyword: "разработка claude-плагинов", weight: 1.0}
       - {keyword: "плагин claude code", weight: 1.0}
@@ -1264,6 +1320,34 @@ nodes:
     attributes:
       tooling_section: "§4.32 #57"
 
+  - id: "#57f"
+    name: "plugin-settings"
+    slug: "plugin-dev:plugin-settings"
+    category: "off-phase"
+    subcategory: "authoring-tooling"
+    status: "active"
+    dormancy_reason: null
+    capabilities: "Настройки плагина: .local.md (YAML-frontmatter + состояние), per-project конфиг."
+    triggers: []
+    boundaries: []
+    chain_membership: []
+    attributes:
+      tooling_section: "§4.32 #57"
+
+  - id: "#57g"
+    name: "skill-development"
+    slug: "plugin-dev:skill-development"
+    category: "off-phase"
+    subcategory: "authoring-tooling"
+    status: "active"
+    dormancy_reason: null
+    capabilities: "Навык плагина: SKILL.md + прогрессивное раскрытие."
+    triggers: []
+    boundaries: []
+    chain_membership: []
+    attributes:
+      tooling_section: "§4.32 #57"
+
   - id: "#58"
     name: "hookify"
     slug: "hookify"
@@ -2083,7 +2167,7 @@ chains:
     sequence:
       - "#56"
       - "#58"
-      - "#57"
+      - "plugin-dev:plugin-structure"
 
   L12:
     name: "CLAUDE.md capture chain"