This Zenodo record documents v1.0 of the CoreLumen PDE Program prototype. The document reports a numerical observation of amplitude-induced suppression of horizon derivative growth within a reduced axisymmetric effective-field model. Three dynamical regimes are identified:Phase A (geometry-dominated),Phase B (balanced),Phase C (amplitude-dominated suppression). This release is an archival prototype record. It does not claim a full nonlinear Kerr–de Sitter stability proof, a global theorem, or UV completion. All constructions satisfy the CoreLumen Structural Charter v1.0:Zρ > 0, Zθ > 0, c_s^2 > 0, c_T = 1. This deposit preserves a reproducible structural state of the project and serves as a versioned research record.