## CHANGES
- Add web search tool for Anthropic and OpenAI models
- Add search location parameter for web search results
- Add image file output option with format support
- Update zsh completion with new search and image flags
- Update bash completion with new option handling logic
- Update fish completion with search and image descriptions
- Support PNG, JPG, JPEG, GIF, BMP image formats
CHANGES:
- Add shell completion support for three major shells
- Create standardized completion scripts in completions/ directory
- Add --shell-complete-list flag for machine-readable output
- Update Print() methods to support plain output format
- Document installation steps for each shell in README
- Replace old fish completion script with improved version
