Add GitPilot 2.0.0 demo, tests, and update metadata

Introduces demo_gitpilot2.py and test_gitpilot2.py for interactive and automated feature testing of GitPilot 2.0.0. Adds TESTING.md with a comprehensive testing guide. Updates package metadata and documentation in PKG-INFO to reflect new features, including repository health monitoring, visual Git graph, AI-powered conflict resolution, and semantic commit search. Updates egg-info sources and adds repo_health module. Minor type hint update in ai_engine.py.

Update README.md

changed

Update package metadata and remove .gitignore

Updated the version, author, and email in gitpilot/__init__.py to reflect new release and ownership. Removed the .gitignore file from the repository.