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-og-image.md

@@ -0,0 +1,36 @@
+---
+name: og-image
+description: Configure Open Graph preview image for social sharing
+---
+
+# Open Graph Image
+
+Set preview image for social media sharing.
+
+## Custom URL
+
+```md
+---
+seoMeta:
+  ogImage: https://url.to.your.image.png
+---
+```
+
+## Local Image
+
+Place `./og-image.png` in project root - Slidev uses it automatically.
+
+## Auto-generate
+
+Generate from first slide:
+
+```md
+---
+seoMeta:
+  ogImage: auto
+---
+```
+
+Uses Playwright to capture first slide. Requires playwright to be installed.
+
+Generated image saved as `./og-image.png` - can be committed to repo.