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/syntax-frontmatter-merging.md

@@ -0,0 +1,49 @@
+---
+name: frontmatter-merging
+description: Priority rules when importing slides with conflicting frontmatter
+---
+
+# Frontmatter Merging
+
+When importing slides, frontmatter from main entry takes priority.
+
+## Example
+
+Main file (`slides.md`):
+```md
+---
+src: ./cover.md
+background: https://sli.dev/bar.png
+class: text-center
+---
+```
+
+Imported file (`cover.md`):
+```md
+---
+layout: cover
+background: https://sli.dev/foo.png
+---
+
+# Cover
+
+Cover Page
+```
+
+## Result
+
+```md
+---
+layout: cover
+background: https://sli.dev/bar.png  # main entry wins
+class: text-center
+---
+
+# Cover
+
+Cover Page
+```
+
+## Priority Rule
+
+Main entry > Imported file for duplicate keys.