Dissociable aging curves across four roles in elite baseball: reproducibility package (code, derived data, and figures)

Reproducibility package for the study "Dissociable aging curves across four roles in elite baseball: early physical decline, prime-years power, and preserved skilled control." It contains the analysis code, the small derived season-level datasets, the frozen result files, and all figures needed to reproduce every quantitative result in the manuscript and supplementary material. Inputs derive from publicly available Statcast and MLB Stats API records for the 2022 to 2025 seasons. The package includes a manuscript-item-to-file crosswalk (RESULTS_MAP), data-provenance notes, a file manifest with SHA-256 checksums, and an environment-requirements file. The code is released under the MIT License and the derived data and documentation under CC BY 4.0 (see LICENSE). This deposit is prepared for double-anonymous peer review and carries no author, affiliation, or funding information; these will be added to the record upon acceptance.