REAL_C dataset: Multi-channel Eliashberg framework data and reproduction package for correlated layered nickelates

Citation. Cite the concept DOI 10.5281/zenodo.19368081. Note: the Citation section inside open_data_README.md incorrectly gives 10.5281/zenodo.19368082 (the v1 version DOI); this will be corrected in the next version cut. CORRECTION 2 (2026-08): the first correction note referred to a Gate-2 quantity labeled "Ds" as a superfluid-stiffness calculation. A subsequent code audit determined that this quantity is a normal-state band-structure diagnostic whose two components carry different physical units and cannot be summed into a stiffness; it is not a superfluid stiffness, and no phase-stiffness or BKT bound (including any temperature ceiling derived from it) should be inferred from this package. The status of the packaged result is unchanged: Tc = 296.70 K is a fixed-package numerical regression benchmark only, not a physical result. See CORRECTION_NOTE_2_gate2_ds_diagnostic.md in this record. CORRECTION (2026-08, v2): the quantity labeled Ws in this package is the s-channel eigenvector mixing weight (d-wave purity), not a superfluid stiffness. The sealed Tc = 296.70 K is a fixed-package numerical benchmark, not a physical result. See CORRECTION_NOTE_Ws_observable.md in this record for the full correction. Sealed computational data and reproduction scripts for the REAL_C configuration (Tc = 296.70 K, μ* = 0.14, Ω_sf = 400 meV) from a multi-channel Eliashberg study of high-Tc parameter-space accessibility in correlated layered nickelates. Includes the Gate4 v2.6 pipeline code, sealed manifest, 105-run parameter landscape survey, and figure-generation scripts. Accompanies the manuscript submitted to npj Quantum Materials (2026).