Data and code for: Boundary-Domain Selection Mechanism for Hopf Bifurcation in a Delayed Nonlocal Transport Model with Danckwerts Flux

This archive provides the data, Python scripts, figures, logs, and script-to-result map supporting the CNSNS submission entitled “Boundary-Domain Selection Mechanism for Hopf Bifurcation in a Delayed Nonlocal Transport Model with Danckwerts Flux.” Version 2.4 corresponds to the cleaned CNSNS submission version with a mechanism-forward title, an Introduction mechanism-reorganization paragraph, an h-weighted Lyapunov-sign normalization defense, an enhanced critical-mode phase portrait for Fig. 6, reduced repeated no-proof wording, unified version labels, and reviewer-facing supporting audit tables. The archive supports the boundary-domain selection mechanism, finite-grid branch-selection workflow, wrong-base versus exchanged-base audit, flux-strength continuation, locally reoptimized threshold checks, finite-grid interval residual/sign enclosure, directed-rounding scalar interval-arithmetic post-audit, h-weighted first Lyapunov coefficient verification, critical-mode IMEX simulations, and near-threshold nonlinear dynamics diagnostics. The supplied files include CSV outputs, manuscript-ready figures, Python scripts, environment files, license files, static-source SHA256 manifest, reproduction logs, and a machine-readable script-to-result matrix. Important scope note: the interval and directed-rounding files certify finite-grid scalar signs and residual inequalities for the submitted semidiscrete boxes. They are not presented as a complete continuous-PDE interval proof. The PDE-level lifting requirements are stated separately in the manuscript.