From Collinear Null Flow to a Certified Trapped Domain in Constrained Null Geometry

This repository contains the article, source files, figures, data products, and reproduction code for the Constrained Null Geometry (CNG) black-hole construction. The work presents a complete geometric chain from a positive collinear null flow to a certified trapped domain. The construction proceeds through first loss, three-channel domain establishment, baryonic (Y^3) closure, timelike emergence, realized multi-lock K-field formation, and escape-action certification. A central result is that the trapped-domain statement is not inferred from an idealized geometric cell. Instead, it is established on the realized multi-lock K-field using retained birth supports and a geometrically defined escape-action barrier. The reported black-hole certificate is therefore tied to the actual realized geometry rather than to an imposed horizon condition. The work further demonstrates that the trapped interior possesses intrinsic proper time and invariant mass through timelike closure. Numerical continuation of the certified trapped state shows a finite, trapped, and dynamically reorganizing interior. No additional collapse prescriptions, singularity assumptions, horizon postulates, or ad hoc dynamical rules are introduced during the continuation stage. The repository includes: Article PDF and LaTeX source. Reproduction code. Numerical data products. Figures used in the manuscript. Verification outputs and consistency checks. The presented results are intended as a geometric black-hole construction within the Constrained Null Geometry framework, where boundary, domain, operator structure, trapped-domain certification, and interior dynamics arise from the same underlying geometric chain.