v1.6.0

Chat Architecture - Multi-participant chat mechanism with conversation coordination, and automatic summaries
ReAct Tool Use - New ReAct (Reasoning and Acting) driver for advanced tool-based reasoning patterns alongside existing tool calling capabilities
Script System Refactoring - Script functionality moved from templates to dedicated messages package with enhanced rendering capabilities

Multi-Participant Chats - Support for multiple LLM participants, human participants, and tool-equipped agents in conversation flows
Chat Coordination - Built-in coordinators including LLM-based, tool-based, and round-robin participant selection
Conversation Summaries - Automatic chat summarization with configurable buffering and context management
Chat State Management - Comprehensive state tracking with steps, outcomes, and continuation criteria
Chat Events - Complete event system for monitoring chat lifecycle, participant selection, and tool usage

ReAct Driver - New reasoning and acting pattern for more sophisticated tool use with decision tracking
Tool Calling Refactoring - Enhanced tool calling driver with improved error handling and execution flow
Tool Execution Formatting - Better formatting and display of tool execution results
Multiple Driver Support - Clean separation between ReAct and tool calling approaches

Messages Package - Script system relocated from templates to messages package for better separation of concerns
Rendering System - New arrow-pipe messages renderer and role-based rendering capabilities
Time Management - Added clock interfaces for better testability and time-dependent operations
Continuation Criteria - Enhanced continuation logic with token limits, execution time limits, and step limits

Structured Output - Improved deserialization and streaming capabilities for structured data
HTTP Client - Enhanced HTTP client handling with better error management
Documentation Testing - Major Doctest architecture refactoring with improved code block extraction and validation
Cohere Integration - Fixed max_tokens parameter handling for Cohere API

Property Info Adapter - Enhanced compatibility with PropertyInfo v7 for better type introspection
Test Infrastructure - Added comprehensive fake inference drivers and mock HTTP testing capabilities
Memory Management - Improved memory handling in streaming and sequence processing

Test Coverage - New test suites for Chat, ToolUse, and Doctest functionality
Mock Infrastructure - Enhanced testing infrastructure with fake drivers and HTTP mocking
Static Analysis - Updated PHPStan and Psalm configurations for better code quality

Package Documentation - Updated CHEATSHEET.md files across packages with comprehensive usage examples
Chat Documentation - New dedicated documentation for chat and tool use patterns
Architecture Guides - Enhanced OVERVIEW.md files explaining package internals and design decisions

Full Changelog: v1.5.0...v1.6.0