Fix #60: Merge duplicate factory implementations

[SoulEvill]

Summary

Consolidates the duplicate factory implementations (factory.py and factory_.py) into a single, well-organized module to eliminate code duplication and improve maintainability.

Changes Made

🔄 Code Consolidation

• Merged Factory class (547 lines) from factory_.py into factory.py
• Merged _default_input_converter function from factory_.py into factory.py
• Organized with clear sections for better code navigation:

  ============================================================================
  IMPORTS
  ============================================================================
  FACTORY CLASS - Core Pipeline Implementation
  ============================================================================
  INPUT CONVERSION UTILITIES
  ============================================================================
  PUBLIC API - Decorator and Functions
  ============================================================================
  MODULE EXPORTS
  ============================================================================
  

🔧 Import Updates

• Updated import in factory_wrapper.py to use consolidated factory module
• Updated import in factory_executor_manager.py to use consolidated factory module
• Fixed circular import issues using TYPE_CHECKING and string annotations

🗑️ Cleanup

• Removed duplicate factory_.py file
• Added comprehensive module docstring
• Added __all__ exports for clean public interface

Test Results

All existing tests pass successfully:

✅ 22 tests passed
⏸️ 2 tests skipped (existing behavior)
🚫 0 tests failed

Acceptance Criteria Verification

• ✅ Single Source File: Only factory.py exists after completion
• ✅ Backward Compatibility: All existing public APIs continue to work without changes
• ✅ Test Compatibility: All existing tests pass with minimal modifications (only import updates)
• ✅ Import Consistency: All internal imports throughout the codebase are updated and functional
• ✅ Functionality Preservation: No existing functionality is lost or altered
• ✅ Clean Exports: Module clearly defines its public interface via __all__
• ✅ Documentation: Module has clear docstrings and section headers for navigation

Benefits

1. Eliminates confusion - Single file to modify for factory functionality
2. Reduces maintenance burden - No more duplicate code
3. Better organization - Clear sections make the 696-line file navigable
4. No breaking changes - Complete backward compatibility maintained

File Size Consideration

The consolidated factory.py is 696 lines, which is within reasonable bounds for a core module. The file is well-organized with clear sections that make navigation straightforward.

Closes #60

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