feat: add a subagent frame

agentlite/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2025-01-30
+
+### Added
+
+- Initial release of AgentLite
+- Core Agent class with streaming and non-streaming interfaces
+- OpenAI-compatible provider implementation
+- Tool system with decorator and class-based tools
+- MCP client for loading tools from MCP servers
+- Pydantic-based configuration system
+- Multi-agent support
+- Full type hints and async/await throughout
+- Comprehensive documentation and examples
+
+### Features
+
+- **Agent**: Main agent class with tool calling loop
+- **OpenAIProvider**: OpenAI API integration with streaming support
+- **MCPClient**: MCP server integration for external tools
+- **Tool System**: Decorator (`@tool`) and class-based (`CallableTool`, `CallableTool2`) tools
+- **Configuration**: Pydantic models for providers, models, and agent settings
+- **Message Types**: ContentPart, Message, ToolCall with streaming merge support
+
+[0.1.0]: https://github.com/yourusername/agentlite/releases/tag/v0.1.0