- Complete ImGui-based GUI application for IGPS control and monitoring
- Real-time positioning visualization with interactive map
- Device management panels (wake/sleep control, configuration)
- IGPS system configuration with sequential workflow
- NATS messaging integration with DeviceManager architecture
- Comprehensive documentation and build instructions
- Add project-wide .gitignore and README.md

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