Addendum D to the ECZC Model Tangential Streaming, Apparent Horizon Placement, and the Observable Luminous Signature of the Elevated Complex Zero-Gap Core

The preceding addenda established the internal architecture of the ECZC core, the discrete bubble-layer accretion mechanism, the axisless isotropic magnetic field, and the photonic exclusion principle. This addendum addresses the external observable consequences of that architecture. We propose that the isotropic magnetic backpressure of the Maglev Zone deflects infalling matter and light into coherent tangential streams along the membrane surface rather than allowing radial infall or radial reflection. This continuous streaming process produces a steady, structured luminous emission analogous in mechanism to auroral plasma dynamics that constitutes the observable electromagnetic signature of a fully developed ECZC object.We further propose a qualitative framework for apparent horizon placement just above the Maglev Zone, note the open theoretical questions that preclude precise mathematical treatment at this stage, and derive a three-class observational taxonomy of ECZC objects at different developmental stages. The observable consequences of this framework are compared with the 2019 Event Horizon Telescope image of M87*, which we propose is consistent with and perhaps better explained by the tangential streaming model than by the classical turbulent accretion disk interpretation.