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>

metabase/skills/dashboard/SKILL.md

@@ -1,13 +1,7 @@
 ---
 name: dashboard
-description: Criar e gerir dashboards Metabase - criar questions, organizar visualizações,
-  adicionar filtros. Dashboards de negócio para bi.descomplicar.pt.
-author: Descomplicar® Crescimento Digital
-version: 1.0.0
-quality_score: 70
-user_invocable: true
-desk_task: null
-allowed-tools: Task, ToolSearch
+description: Criação e gestão de dashboards Metabase — questions, visualizações e filtros para bi.descomplicar.pt.
+disable-model-invocation: true
 ---
 
 # Skill /dashboard - Metabase Dashboard Management

metabase/skills/metabase/SKILL.md

@@ -1,13 +1,6 @@
 ---
 name: metabase
-description: Operações Metabase BI - explorar databases, listar dashboards, gerir collections,
-  ver questions. Gateway para bi.descomplicar.pt via MCP.
-author: Descomplicar® Crescimento Digital
-version: 1.0.0
-quality_score: 70
-user_invocable: true
-desk_task: null
-allowed-tools: Task, ToolSearch
+description: Operações Metabase BI — explorar bases de dados, listar dashboards, gerir collections e questions via bi.descomplicar.pt.
 ---
 
 # Skill /metabase - Metabase BI Operations

metabase/skills/query/SKILL.md

@@ -1,13 +1,6 @@
 ---
 name: query
-description: Executar queries SQL no Metabase com linguagem natural. Explorar tabelas,
-  extrair métricas, criar reports ad-hoc via bi.descomplicar.pt.
-author: Descomplicar® Crescimento Digital
-version: 1.0.0
-quality_score: 70
-user_invocable: true
-desk_task: null
-allowed-tools: Task, ToolSearch
+description: Execução de queries SQL no Metabase com linguagem natural. Explorar tabelas, extrair métricas e criar relatórios ad-hoc.
 ---
 
 # Skill /query - Metabase SQL Query Assistant