Release v1.3

feat: add configurable Claude model selection

- Add support for multiple Claude models (3.5/3.7 Sonnet, 4 Sonnet/Opus)
- Implement smart planner model selection based on main model
- Add conditional thinking capabilities (disabled for 3.5 Sonnet)
- Enhance cost tracking with model-specific pricing
- Add new settings commands: --set-model and --list-models
- Include cost warnings for expensive models (4 Opus)
- Update documentation with model configuration guide

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>