- Implement extensible parser architecture with BaseOutputParser abstract class
- Add OutputFormatRegistry for automatic format detection and parsing
- Support OpenAI Harmony format with analysis and commentary channels
- Maintain full backward compatibility with existing ReAct format
- Add comprehensive tests for both formats and automatic detection
- Zero breaking changes - existing ReAct code continues to work unchanged
Addresses issue #3508: Support for Multiple LLM Output Formats Beyond ReAct
Co-Authored-By: João <joao@crewai.com>