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
## CHANGES
- Add prompt strategies like Chain of Thought (CoT)
- Implement strategy selection with `--strategy` flag
- Improve README with platform-specific installation instructions
- Fix web interface documentation link
- Refactor git operations with new githelper package
- Add `--liststrategies` command to view available strategies
- Support applying strategies to system prompts
- Fix YouTube configuration check
- Improve error handling in session management
