Black-Hole Horizon Dynamics and Terminal Ledger Evolution

SCQG paper 20 of 28. Paper 20 develops black-hole horizon dynamics, Hawking radiation and terminal boundary preparation within the Semantic Commitment / Quantum Gravity framework. It relates horizon area to maximum information capacity and, on the saturation branch, black-hole entropy. With the speed of light and Boltzmann constant set to one, the entropy is S = A/(4Gℏ). For the stated Hawking state and field domains, the paper calculates emission with particle masses, rotation, charge and transmission through the exterior potential. It tracks the resulting energy, angular momentum and charge fluxes together with the selected gravitational source. A Schwarzschild calculation compares interior proper time with the exterior evaporation timescale and derives a finite mass-loss bound when the relation between the clocks is controlled. Emitted radiation becomes a usable local record through a physical detector interaction and decoder. Local grounding depends on the forward action that makes the distinction available there. The paper gives finite-exposure discrimination bounds and separates the Page entropy benchmark, quantum extremal surfaces and recovery by an explicit quantum operation. A terminal ledger is an account of the black-hole, radiation, exterior-record and unresolved-edge states, together with the systems that carry them. Population transport, mergers and evaporation determine these accounts. Their combination, the terminal screen quotient and conformal compactification supply boundary data for the reciprocal CPT endpoint conditions. Matter, energy, entropy and records remain within their branches. The paper states the conditions for terminal fixed points and reciprocal fixed classes. An explicit finite controller retains its battery and clock and shows how a later quantum recurrence limits the durability of a proposed terminal state.