Release v0.2.0: Core DSPy Features Implementation

[obie]

Summary

This PR introduces the v0.2.0 release of Desiru, implementing the core DSPy functionality in Ruby. This represents a major milestone with comprehensive implementations of all key DSPy components.

Major Features Implemented

• MIPROv2 Optimizer: Complete implementation of the state-of-the-art MIPROv2 optimizer with instruction generation, proposal management, and multi-stage optimization
• BestOfN Module: Full implementation with reranking capabilities, custom scoring functions, and comprehensive error handling
• Example/Prediction Data Structures: Core data containers for managing inputs, outputs, and metadata throughout the DSPy pipeline
• Trace Collection Infrastructure: Complete tracing system for tracking module execution, LLM calls, and optimization steps
• Compilation Framework: Full compiler implementation supporting module transformation, parameter optimization, and cross-validation

Test Suite Improvements

• Before: 88 failing tests, incomplete coverage
• After: 860 passing tests, 0 failures, 6 pending tests
• Added comprehensive test coverage for all new modules
• Integration tests validating cross-module functionality
• Performance and edge case testing

Code Quality Improvements

• Full RuboCop compliance across the codebase
• Consistent Ruby idioms and best practices
• Improved documentation and code organization
• Better error handling and validation

Issues Addressed

This release closes multiple issues related to core DSPy functionality implementation and test suite stability.

Test Plan

• All unit tests passing (860 tests, 0 failures)
• Integration tests validate module interactions
• RuboCop linting passes
• Documentation updated
• Version bumped to 0.2.0

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