Adds a new "Model Selection" section that explains when and why to choose different Claude models (haiku, sonnet, opus, inherit) for agents. Includes: - Model characteristics comparison table - Decision matrix for agent task types - Concrete examples with reasoning - Best practices for model selection - Guidance on when to use `inherit` Closes #17 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>