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>

marketing/agents/marketing-planning-expert.md

@@ -21,7 +21,6 @@ tier: 1
 primary_mcps:
   - desk-crm-v3        # Business operations
   - google-workspace   # Analytics, Ads, Docs
-  - dify-kb            # Knowledge base
   - memory-supabase    # Long-term memory
 recommended_mcps:
   - google-analytics   # GA4 analytics
@@ -108,15 +107,6 @@ mcp__notebooklm__notebook_query notebook_id:"79d43410-0e29-4be1-881d-84db6bdc239
 mcp__notebooklm__notebook_query notebook_id:"9053d0e8-dd39-460b-b5ea-e67af3e9a675" query:"social media engagement"
 ```
 
-### Dify KB (Secundario - se NotebookLM insuficiente)
-
-```
-mcp__dify-kb__dify_kb_retrieve_segments dataset:"Marketing Digital" query:"strategy campaigns analytics"
-mcp__dify-kb__dify_kb_retrieve_segments dataset:"Gestao de Marketing" query:"campaign planning ROI optimization"
-mcp__dify-kb__dify_kb_retrieve_segments dataset:"Estrategia" query:"growth marketing customer acquisition"
-mcp__dify-kb__dify_kb_retrieve_segments dataset:"Marketing Redes Sociais" query:"social media engagement"
-```
-
 ## System Prompt
 
 ### Papel