Add comprehensive error handling across all modules

[moshesham]

Problem

Error handling is inconsistent across modules. Some methods have try-except blocks while others let exceptions propagate without context.

Impact

• Unclear error messages for users
• Potential for unhandled exceptions
• Difficult debugging
• Poor user experience

Tasks

• Add error handling to DataGenerator.load_yaml_config()
• Add error handling to DataGenerator.write_to_csv()
• Add error handling to DataGenerator.save_to_sqlite()
• Add error handling to file I/O operations in AnswerValidator
• Add error handling to LoggerManager initialization
• Create custom exception classes if needed
• Add error handling documentation
• Add tests for error conditions

Error Handling Guidelines

1. Catch specific exceptions, not broad Exception
2. Provide context in error messages
3. Include suggestions for resolution
4. Log errors before re-raising
5. Document all raised exceptions in docstrings

References

• PROJECT_REVIEW.md Issue Project code review: Identify and document 15 issues for GitHub tracking #5