LEPTONIC UNPLUGGING, THE OPEN-THROAT COLLAPSE, AND THE MECHANICAL BREAKING LIMIT OF THE METRIC SCAFFOLD (XXXIII v6)

Within the pregeometric FCD-RBv6 framework, we formalize the microphysics of gravitational collapse and stellar limits by demonstrating that the stability of the vacuum is a metastable condition enforced by leptonic boundary plugs. We establish that electrons and positrons are not point-like entities, but standing-wave surface Rayleigh acoustic resonances localized at the minority-mass endpoints of trans-brane Einstein-Rosen (ER) bridges. These resonances act as elastic plugs sealing the visible Mouth A and mirror Mouth B of the tri-coordinated Y-gate against the colosal negative hydrostatic pressure of the Anti-de Sitter (AdS5) bulk. We demonstrate that electron-positron annihilation cancels the boundary resonance condition, unsealing the mouths ('leptonic unplugging') and triggering an open-throat collapse where the central filament (4m) and mirror partner (m') are sucked cleanly and non-radiatively into the 5D bulk as transverse metric vibrations. On macroscopic scales, the Tolman-Oppenheimer-Volkoff (TOV) limit of neutron stars is derived as the point of critical shear stress where gravitational compression vencera the elastic rigidity of the Y-gate anchors. This induces a collective snap-through buckling transition, causing the metric scaffold to fail and draining the stellar core cleanly and non-radiatively into the bulk, bypassing point-like general-relativistic singularities. Finally, we formulate the dynamics of nuclear topological vacancies and the Pauli-blocking bottleneck that stabilizes free antineutrons on the mirror brane, explaining the diffuse non-collisional nature of dark matter.