Update to code-simplifier

{
  "official": [
    {
      "name": "code-simplifier",
      "author": {
        "name": "Anthropic",
        "email": "support@anthropic.com"
      },
      "source": "./plugins/code-simplifier",
      "category": "productivity",
      "homepage": "https://github.com/anthropics/claude-plugins-official/tree/main/plugins/code-simplifier",
      "description": "Agent that simplifies and refines code for clarity, consistency, and maintainability while preserving functionality. Focuses on recently modified code."
    }
  ]
}