Merge pull request #21: SDK-based evaluation framework with modular architecture

feat: SDK-based evaluation framework with modular architecture and comprehensive testing

- Complete SDK-based evaluation framework for testing agents
- Modular architecture (test-runner split into 4 focused modules)
- 20+ test cases across multiple categories
- Interactive results dashboard
- Comprehensive documentation (1,600+ lines)
- Organized script structure
- Enhanced agents (openagent + opencoder)

Stats: 155 files changed, 29,312 insertions, 634 deletions