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/code-line-numbers.md

@@ -0,0 +1,46 @@
+---
+name: line-numbers
+description: Enable line numbering for code blocks globally or per-block
+---
+
+# Code Block Line Numbers
+
+Enable line numbering for code blocks.
+
+## Global Setting
+
+Enable for all code blocks in headmatter:
+
+```md
+---
+lineNumbers: true
+---
+```
+
+## Per-Block Setting
+
+````md
+```ts {6,7}{lines:true,startLine:5}
+function add(
+  a: Ref<number> | number,
+  b: Ref<number> | number
+) {
+  return computed(() => unref(a) + unref(b))
+}
+```
+````
+
+## Options
+
+- `lines: true/false` - Enable/disable line numbers
+- `startLine: number` - Starting line number (default: 1)
+
+## With Line Highlighting
+
+Use `{*}` as placeholder when combining with other features:
+
+````md
+```ts {*}{lines:true,startLine:5}
+// code here
+```
+````