Reorganize: Move all skills to skills/ folder

- Created skills/ directory
- Moved 272 skills to skills/ subfolder
- Kept agents/ at root level
- Kept installation scripts and docs at root level

Repository structure:
- skills/           - All 272 skills from skills.sh
- agents/           - Agent definitions
- *.sh, *.ps1       - Installation scripts
- README.md, etc.   - Documentation

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

skills/ts-library/skill.md

@@ -0,0 +1,47 @@
+---
+name: ts-library
+description: Use when authoring TypeScript libraries - covers project setup, package exports, build tooling (tsdown/unbuild), API design patterns, type inference tricks, testing, and release workflows. Patterns extracted from 20+ high-quality ecosystem libraries.
+license: MIT
+---
+
+# TypeScript Library Development
+
+Patterns for authoring high-quality TypeScript libraries, extracted from studying unocss, shiki, unplugin, vite, vitest, vueuse, zod, trpc, drizzle-orm, and more.
+
+## When to Use
+
+- Starting a new TypeScript library (single or monorepo)
+- Setting up package.json exports for dual CJS/ESM
+- Configuring tsconfig for library development
+- Choosing build tools (tsdown, unbuild)
+- Designing type-safe APIs (builder, factory, plugin patterns)
+- Writing advanced TypeScript types
+- Setting up vitest for library testing
+- Configuring release workflow and CI
+
+**For Nuxt module development:** use `nuxt-modules` skill
+
+## Quick Reference
+
+| Working on...         | Load file                                                          |
+| --------------------- | ------------------------------------------------------------------ |
+| New project setup     | [references/project-setup.md](references/project-setup.md)         |
+| Package exports       | [references/package-exports.md](references/package-exports.md)     |
+| tsconfig options      | [references/typescript-config.md](references/typescript-config.md) |
+| Build configuration   | [references/build-tooling.md](references/build-tooling.md)         |
+| API design patterns   | [references/api-design.md](references/api-design.md)               |
+| Type inference tricks | [references/type-patterns.md](references/type-patterns.md)         |
+| Testing setup         | [references/testing.md](references/testing.md)                     |
+| Release workflow      | [references/release.md](references/release.md)                     |
+| CI/CD setup           | [references/ci-workflows.md](references/ci-workflows.md)           |
+
+## Key Principles
+
+- ESM-first: `"type": "module"` with `.mjs` outputs
+- Dual format: always support both CJS and ESM consumers
+- `moduleResolution: "Bundler"` for modern TypeScript
+- tsdown for most builds, unbuild for complex cases
+- Smart defaults: detect environment, don't force config
+- Tree-shakeable: lazy getters, proper `sideEffects: false`
+
+_Token efficiency: Main skill ~300 tokens, each reference ~800-1200 tokens_