feat: Complete fleet — 94 skills across 10+ domains

Pulled ALL skills from 15 source repositories:
- anthropics/skills: 16 (docs, design, MCP, testing)
- obra/superpowers: 14 (TDD, debugging, agents, planning)
- coreyhaines31/marketingskills: 25 (marketing, CRO, SEO, growth)
- better-auth/skills: 5 (auth patterns)
- vercel-labs/agent-skills: 5 (React, design, Vercel)
- antfu/skills: 16 (Vue, Vite, Vitest, pnpm, Turborepo)
- Plus 13 individual skills from various repos

Mosaic Stack is not limited to coding — the Orchestrator and
subagents serve coding, business, design, marketing, writing,
logistics, analysis, and more.

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

skills/slidev/references/build-seo-meta.md

@@ -0,0 +1,43 @@
+---
+name: seo-meta
+description: Configure SEO and social media meta tags
+---
+
+# SEO Meta Tags
+
+Configure social media and search engine meta tags.
+
+## Configuration
+
+```yaml
+---
+seoMeta:
+  ogTitle: Slidev Starter Template
+  ogDescription: Presentation slides for developers
+  ogImage: https://cover.sli.dev
+  ogUrl: https://example.com
+  twitterCard: summary_large_image
+  twitterTitle: Slidev Starter Template
+  twitterDescription: Presentation slides for developers
+  twitterImage: https://cover.sli.dev
+  twitterSite: username
+  twitterUrl: https://example.com
+---
+```
+
+## Available Options
+
+**Open Graph (Facebook, LinkedIn):**
+- `ogTitle` - Title
+- `ogDescription` - Description
+- `ogImage` - Preview image URL
+- `ogUrl` - Canonical URL
+
+**Twitter Card:**
+- `twitterCard` - Card type (summary, summary_large_image)
+- `twitterTitle` - Title
+- `twitterDescription` - Description
+- `twitterImage` - Preview image URL
+- `twitterSite` - Twitter username
+
+Powered by unhead.