Vadim Bertrand developed a comprehensive project planning artifact for the Diff4Earth/ige-jaxathon-2025 repository, focusing on the Pastax Global Calibration initiative. He authored a detailed Markdown document that formalized the calibration workflow for stochastic trajectory simulators, outlining team roles, project scope, metrics, tooling, and success criteria. By consolidating all planning materials into a single, version-controlled file, Vadim streamlined onboarding and governance processes. His work emphasized documentation and project planning skills, providing a reusable blueprint for future calibration efforts. Although no bugs were addressed during this period, the depth of planning established a strong foundation for subsequent technical development.