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/tsdown/README.md

@@ -0,0 +1,69 @@
+# tsdown Skills for Claude Code
+
+Agent skills that help Claude Code understand and work with [tsdown](https://tsdown.dev), the elegant library bundler.
+
+## Installation
+
+```bash
+npx skills add rolldown/tsdown
+```
+
+This will add the tsdown skill to your Claude Code configuration.
+
+## What's Included
+
+The tsdown skill provides Claude Code with knowledge about:
+
+- **Core Concepts** - What tsdown is, why use it, key features
+- **Configuration** - Config file formats, options, multiple configs, workspace support
+- **Build Options** - Entry points, output formats, type declarations, targets
+- **Dependency Handling** - External/inline dependencies, auto-externalization
+- **Output Enhancement** - Shims, CJS defaults, package exports
+- **Framework Support** - React, Vue, Solid, Svelte integration
+- **Advanced Features** - Plugins, hooks, programmatic API, Rolldown options
+- **CLI Commands** - All CLI options and usage patterns
+- **Migration** - Migrating from tsup to tsdown
+
+## Usage
+
+Once installed, Claude Code will automatically use tsdown knowledge when:
+
+- Building TypeScript/JavaScript libraries
+- Configuring bundlers for library projects
+- Setting up type declaration generation
+- Working with multi-format builds (ESM, CJS, IIFE, UMD)
+- Migrating from tsup
+- Building framework component libraries
+
+### Example Prompts
+
+```
+Set up tsdown to build my TypeScript library with ESM and CJS formats
+```
+
+```
+Configure tsdown to generate type declarations and bundle for browsers
+```
+
+```
+Add React support to my tsdown config with Fast Refresh
+```
+
+```
+Help me migrate from tsup to tsdown
+```
+
+```
+Set up a monorepo build with tsdown workspace support
+```
+
+## Documentation
+
+- [tsdown Documentation](https://tsdown.dev)
+- [GitHub Repository](https://github.com/rolldown/tsdown)
+- [Rolldown](https://rolldown.rs)
+- [Migration Guide](https://tsdown.dev/guide/migrate-from-tsup)
+
+## License
+
+MIT