RSF Model 1 CLASS Patch 1 Diagnostic Prototype

Description / Abstract: This package documents the first successful CLASS source-level diagnostic patch for the Model 1 residual-response growth-suppression ansatz in the 7-phi framework. Model 1 uses the response function: mu_MG(k,a) = 1 - epsilon_S [k^2/(k^2+k_t^2)] / [1 + u0 a^(-p)] Patch 1 does not modify perturbation evolution, metric equations, matter evolution, CMB spectra, or the internal matter-power calculation. It is a diagnostic plumbing prototype that verifies the Model 1 response function can be embedded in CLASS source code and routed through CLASS file-output transfer functions. The diagnostic output column is: rsf_sqrt_mu = sqrt(mu_MG(k,a=1)) using the emulator-corrected seed: epsilon_S = 0.26u0 = 0.5p = 1.5k_t = 0.10104 1/Mpc corresponding to: k_t = 0.15 h/Mpc for h = 0.6736. The diagnostic column written to rsf_diag_00_tk.dat matches the expected analytic curve to numerical precision, with maximum absolute difference approximately 4.98e-14 and mean absolute difference approximately 2.40e-14. This package is a diagnostic implementation milestone only. It does not constitute a physical Boltzmann implementation of Model 1 and does not claim a cosmological fit. DISCLAIMER Generative AI was used to assist with [literature screening / coding support / draft language revision]. All AI-assisted outputs were independently checked by the author, and the author takes full responsibility for the final analysis and text. This is encompassing all the work that has been done and will be done. All code is under MIT licensing. All research papers are under Creative Commons License. All code, outputs and notes are included in the reproducibility bundle zip file.