chore: sync indexes, update marketplace and docs for 4 new community skills

- Codex CLI: 182 skills, 4 new symlinks
- Gemini CLI: 274 items, 4 new
- engineering plugin.json: 36→38
- finance plugin.json: 2→3
- marketing plugin.json: 43→44
- marketplace.json: updated 3 bundle descriptions
- mkdocs.yml: 4 new nav entries
- docs/index.md + getting-started.md: domain counts updated
- 273 docs pages generated

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/getting-started.md

@@ -141,7 +141,7 @@ Choose your platform and follow the steps:
 | Bundle | Install Command | Skills |
 |--------|----------------|--------|
 | **Engineering Core** | `/plugin install engineering-skills@claude-code-skills` | 36 |
-| **Engineering POWERFUL** | `/plugin install engineering-advanced-skills@claude-code-skills` | 36 |
+| **Engineering POWERFUL** | `/plugin install engineering-advanced-skills@claude-code-skills` | 38 |
 | **Product** | `/plugin install product-skills@claude-code-skills` | 15 |
 | **Marketing** | `/plugin install marketing-skills@claude-code-skills` | 44 |
 | **Regulatory & Quality** | `/plugin install ra-qm-skills@claude-code-skills` | 14 |

docs/index.md

@@ -143,7 +143,7 @@ hide:
 
     Agent designer, RAG architect, database designer, CI/CD builder, MCP server builder, security auditor, tech debt tracker
 
-    [:octicons-arrow-right-24: 36 skills](skills/engineering/)
+    [:octicons-arrow-right-24: 38 skills](skills/engineering/)
 
 -   :material-bullseye-arrow:{ .lg .middle } **Product**
 
@@ -159,7 +159,7 @@ hide:
 
     Content, SEO, CRO, channels, growth, intelligence, sales — 7 specialist pods with 32 Python tools
 
-    [:octicons-arrow-right-24: 43 skills](skills/marketing-skill/)
+    [:octicons-arrow-right-24: 44 skills](skills/marketing-skill/)
 
 -   :material-clipboard-check:{ .lg .middle } **Project Management**