Causal Phase Conjugation: A Kinematic Derivation of Antimatter, Mass Quantization, and Vacuum Engineering from Time-Symmetric Causality

Standard Quantum Field Theory treats particles as fundamental excitations and antimatter as a consequence of CPT symmetry, yet lacks a geometric derivation for the stability of mass or the mechanism of decay. Building on the Causal Latency framework [P1, P2], we propose that stable matter is a Causal Knot: a standing wave formed by the constructive interference of a Retarded Potential (propagating $t \to \infty$) and an Advanced Potential (propagating $t \to -\infty$). By simulating the interference of causal signals in a latency-constrained vacuum, we derive: (1) Inertial Mass as the refresh rate omega of the causal handshake, (2) Antimatter as the phase-conjugate (time-reversed) solution required to maintain unitarity, and (3) Mass Quantization as discrete resonance peaks in the vacuum's causal consistency spectrum. Furthermore, we demonstrate that high-energy perturbations can "unlock" this resonance, providing a kinematic mechanism for Pair Production and Nuclear Decay. Finally, we propose Resonant Vacuum Breakdown as a pathway for industrial antimatter production, showing that coherent stimulation at 2 omega induces exponential pair creation at energies below the Schwinger limit.