Developed a comprehensive project planning artifact for the Diff4Earth/ige-jaxathon-2025 repository, focusing on the Pastax Global Calibration initiative. The work centered on authoring 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 resource, the developer streamlined onboarding and established clear governance for the project. Emphasizing documentation and project planning skills, the approach provided a reusable blueprint to guide future calibration efforts, ensuring alignment across stakeholders and supporting the structured execution of complex simulation calibration tasks.