SECTOR PAPER XVIII — Zero‑Parameter Cosmological Parity Violation and Horizon Dynamics in the Unified Information Substrate

Sector XVIII presents the zero‑parameter cosmological parity‑violation result of the Unified Information Substrate. The δI‑substrate generates a global, parity‑odd trispectrum and horizon‑scale geometric asymmetry without requiring additional fields, parameters, or symmetry‑breaking mechanisms. This sector demonstrates that the observed large‑scale cosmological parity‑odd signatures arise directly from correlation‑geometry flow within the substrate and remain consistent across CMB, LSS, and horizon‑proximal probes. Classical ΛCDM cannot produce these signatures without external parity‑violating physics, whereas the δI‑substrate generates them intrinsically. Sector XVIII forms the third component of the horizon‑collapse chain and establishes the cosmological‑scale parity‑odd invariant of the δI‑substrate.