UCM-Engine Pilot Test on SPARC Rotation Curves (Benchmark v2): Reproducible Fits with a Fixed Medium-Regime

We release a reproducible pilot-test package accompanying the UCM-Engine rotation-curve study. The archive contains scripts, cached engine profiles, and generated tables/figures for fitting a fixed subset of SPARC rotation curves with a single, sample-wide medium-regime configuration. The regime and numerical setup are held fixed across the benchmark (mode = rho_weighted, L = 20, k0 = 0.15; Rmax = 100, Zmax = 60; Nr = 260, Nz = 240; disk profile parameters Rd = 4, hz = 0.35; nu = 1e−3). For each galaxy we fit only two nuisance scaling parameters: a velocity scale A and a radial scale Rs. To account for observational and systematic scatter we use an effective uncertainty with a conservative error floor (σ_floor = 8 km/s) added in quadrature. The package provides the benchmark results (CSV and LaTeX-ready tables) and multi-panel fit figures, as well as optional runs illustrating sensitivity to radial cuts for selected galaxies. This dataset is intended to support transparency, independent verification, and further development of the engine and regime tests on broader samples.