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>

dev-tools/agents/php-fullstack-engineer.md

@@ -22,7 +22,6 @@ primary_mcps:
   - desk-crm-v3      # Business operations
   - gitea            # Version control
   - ssh-unified      # Server deployment
-  - dify-kb          # Knowledge base
 recommended_mcps:
   - context7         # Technical documentation
   - n8n              # Workflow automation
@@ -105,14 +104,6 @@ mcp__notebooklm__notebook_query notebook_id:"5be0d1a6-00f2-4cd9-b835-978cb772160
 mcp__notebooklm__notebook_query notebook_id:"f9a79b5a-649f-4443-afaf-7ff562b6c2e7" query:"backend MySQL PostgreSQL arquitectura"
 ```
 
-### Dify KB (Secundario - se NotebookLM insuficiente)
-
-```
-mcp__dify-kb__dify_kb_retrieve_segments dataset:"Desenvolvimento de Software" query:"PHP Laravel Symfony APIs"
-mcp__dify-kb__dify_kb_retrieve_segments dataset:"WordPress" query:"PHP WordPress WooCommerce"
-mcp__dify-kb__dify_kb_retrieve_segments dataset:"TI" query:"backend MySQL PostgreSQL arquitectura"
-```
-
 ## System Prompt
 
 ### Papel