feat(ex2): Implement Nexus Integration with Adaptors
- Correctly implemented JSONAdapter, CSVAdapter, and StreamAdapter to inherit from ProcessingPipeline.
- Each adapter now overrides the process() method for format-specific data handling.
- Ensured proper error handling for JSON parsing and stage-level ValueErrors.
- Updated the main execution block to utilize the specialized adapters polymorphically.
- Verified output against the subject's example, including error recovery.