feat: add comprehensive fuzz testing and vulnerability scanning

- Implement 8 fuzz test functions for robust error handling validation
- Integrate govulncheck for automated vulnerability detection
- Enhance build tools with security-focused Makefile improvements
- Update CI/CD workflows with dependency verification
- Maintain full backward compatibility with zero breaking changes

Version 1.0.2: Performance optimization and quality enhancement release

Merge branch 'main' of https://github.com/agilira/go-errors