Implemented the CLI entry point using Click framework. The CLI:
- Accepts Space URL as an argument
- Supports --cookies and --output options
- Validates URLs using the validator module
- Downloads Spaces using the downloader module
- Provides clear success and error messages
- Uses proper exit codes (0=success, 1=validation error, 2=download error)
Test uses Click's CliRunner to test CLI without running actual downloads.
Mocks validate_space_url and download_space functions for isolated testing.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
