feat: Install built-in agents

assets/agents/coder/README.md

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+# Coder
+
+An AI agent that assists you with your coding tasks.
+
+## Features
+
+- 🏗️ Intelligent project structure creation and management
+- 🖼️ Convert screenshots into clean, functional code
+- 📁 Comprehensive file system operations (create folders, files, read/write files)
+- 🧐 Advanced code analysis and improvement suggestions
+- 📊 Precise diff-based file editing for controlled code modifications
+
+## Similar Projects
+
+- https://github.com/Doriandarko/claude-engineer
+- https://github.com/paul-gauthier/aider