Black Hole Interior Dynamics and Horizon Mechanics within the HRDCC Framework

The Holographic Rotation-Driven Cyclic Cosmology (HRDCC) framework introduced in earlier papers assumes that successive cosmological cycles remain physically connected through a regularized Holographic Transition Core (HTC). While this effective phenomenological description provides a consistent cosmological framework, its microscopic interior dynamics have not yet been examined. In the present work, we investigate the physical mechanisms that may underlie the regularized transition region by considering the internal structure of rotating parent black holes. The discussion focuses on Kerr and Kerr-Newman interior geometries, Cauchy-horizon dynamics, mass inflation, Einstein-Cartan-Sciama-Kibble gravity, holographic information encoding, and effective horizon mechanics. Rather than proposing a complete quantum-gravitational theory, we develop a phenomenological microscopic interpretation that remains consistent with the effective framework established previously. The analysis suggests that the Holographic Transition Core may be interpreted as an effective interior boundary where horizon dynamics, rotational energy storage, and holographic information transfer become coupled. This interpretation provides a physically motivated bridge between the effective cosmological description developed in earlier papers and the microscopic mechanisms that may govern the interior evolution of the parent black hole. The present work therefore establishes an effective phenomenological description of interior horizon dynamics while leaving a complete microscopic quantum-gravitational derivation for future investigations. This manuscript constitutes the first paper of the HRDCC publication program. It is distributed as a preprint and has not undergone formal peer review.