TFD Ringdown Resonance: Audit-Ready Reconstruction of GW150914

This work presents an audit-ready, fully reproducible ringdown analysis of GW150914 within the Tensor Field Dynamics (TFD) framework. It uses a canonical TFD fit class with amplitude-dependent dissipation and derives the envelope relation[\ln A + \frac{A^2}{2} = -\Gamma_0 t + C .] The evaluation follows a deterministic pipeline (HDF5 time axis, whitening, band-pass filtering, H1/L1 alignment, peak picking, and a fixed ringdown window) without any post hoc expansion of degrees of freedom in the audit workflow. Single-mode and two-mode fits are compared for H1 and L1, with model selection based on the Bayesian Information Criterion (BIC). The document provides a canonical TFD ringdown reference version with explicit reproducibility and an audit-capable evidence structure, including fits, residuals, spectra, and autocorrelation analyses.