Late-time cosmology from the B-Project: modular dynamics, dynamical ψ(a), ISW signatures, and multi-redshift BAO constraints

This deposit provides the full numerical and data-analysis pipelines accompanying the preprint “Late-time cosmology from the B-Project: modular dynamics, dynamical ψ(a), ISW signatures, and multi-redshift BAO constraints.” It includes two independent Boltzmann-solver implementations: • a CAMB-based pipeline • a CLASS-based pipeline (via Cobaya) Both pipelines implement late-time B-Project dynamics only, while preserving early-universe physics, including recombination and the baryon-drag sound horizon. The deposit contains: • all BAO distance ratios used in the paper, • BAO-driven H₀ scans and mappings, • early-universe consistency checks (z_* and r_drag), • large-scale CMB temperature spectra illustrating the late ISW regime, • machine-readable tables (CSV) for all reported numerical values. Legacy labels “CET Ω” appearing in some filenames or console outputs correspond to the same late-time B-Project sector and reflect naming conventions used during early development stages. This archive ensures full transparency, reproducibility, and independent verification of the numerical results presented in the manuscript.