chore: release v4.0.0 - sync 550+ skills and restructure docs

skills/tailwind-design-system/SKILL.md

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+---
+name: tailwind-design-system
+description: Build scalable design systems with Tailwind CSS, design tokens, component libraries, and responsive patterns. Use when creating component libraries, implementing design systems, or standardizing UI patterns.
+---
+
+# Tailwind Design System
+
+Build production-ready design systems with Tailwind CSS, including design tokens, component variants, responsive patterns, and accessibility.
+
+## Use this skill when
+
+- Creating a component library with Tailwind
+- Implementing design tokens and theming
+- Building responsive and accessible components
+- Standardizing UI patterns across a codebase
+- Migrating to or extending Tailwind CSS
+- Setting up dark mode and color schemes
+
+## Do not use this skill when
+
+- The task is unrelated to tailwind design system
+- You need a different domain or tool outside this scope
+
+## Instructions
+
+- Clarify goals, constraints, and required inputs.
+- Apply relevant best practices and validate outcomes.
+- Provide actionable steps and verification.
+- If detailed examples are required, open `resources/implementation-playbook.md`.
+
+## Resources
+
+- `resources/implementation-playbook.md` for detailed patterns and examples.