feat: refactor 30+ skills to Anthropic progressive disclosure pattern

- All SKILL.md files now <500 lines (avg reduction 69%)
- Detailed content extracted to references/ subdirectories
- Frontmatter standardised: only name + description (Anthropic standard)
- New skills: brand-guidelines, spec-coauthor, report-templates, skill-creator
- Design skills: anti-slop guidelines, premium-proposals reference
- Removed non-standard frontmatter fields (triggers, version, author, category)

Plugins affected: infraestrutura, marketing, dev-tools, crm-ops, gestao,
core-tools, negocio, perfex-dev, wordpress, design-media

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

automacao/skills/n8n-chatbot/SKILL.md

@@ -1,7 +1,29 @@
+---
+name: n8n-chatbot
+description: Criação de chatbots e workflows com inteligência artificial usando LangChain no n8n.
+---
+
 # /n8n-chatbot - Chatbots e AI Agents n8n
 
 Criar chatbots e workflows com AI usando LangChain.
 
+## Contexto NotebookLM
+
+ANTES de executar, consultar notebooks para contexto especializado:
+
+| Notebook | ID | Consultar quando |
+|----------|-----|-----------------|
+| n8n Deep Research | f2c809b8-1cb5-4dd0-aa7e-be2cfb6704d1 | Sempre |
+
+```
+mcp__notebooklm__notebook_query({
+  notebook_id: "f2c809b8-1cb5-4dd0-aa7e-be2cfb6704d1",
+  query: "<adaptar ao contexto do pedido do utilizador>"
+})
+```
+
+Integrar insights do NotebookLM nas recomendações e decisões.
+
 ---
 
 ## Uso