Zinf-Limit Spatial Quantum

The Zinf-Limit Spatial Quantum is the causal spatial increment per half-cycle: the farthest a signal can travel at the computational lightspeed bound in one Pulse Rhythm, scaled by a safety factor, and therefore the smallest spatial step that stays causally coherent. It is the spatial partner of the Local Rhythm Quantum, the Pulse Rhythm of the Zinf-Limit Universe, ①⥂⧖ = ①⥂⧗⌂/2, in the book's Fundamental Quanta, and together they ground causality in an exact grid of temporal and spatial quantization. Because a signal crosses the pulse one way in one Rhythm, the quantum equals the Pulse Diameter times the safety factor. Under the Pixel Quantization Principle, one pixel equals one Zinf: every minimal boundary cell has linear extent ℓ_z and must recollapse from 1 to 0 each frame unless re-excited. When a universe operates at this quantum it reaches Maximal Computational Efficiency with minimal geometric overhead. ℓ_z = κ_z × 𝒞→ × ①⥂⧖ = κ_z × ①⊕, where ℓ_z is the Zinf-limit spatial quantum [𝕃], κ_z a safety factor ensuring stable discretization, κ_z ≥ 1 [∅], 𝒞→ the computational lightspeed bound from BPT propagation dynamics [𝕃·𝕋⁻¹], ①⥂⧖ the half-cycle time quantum, the Pulse Rhythm [𝕋], and ①⊕ the Pulse Diameter. The book checks [𝕃] = [∅] × [𝕃·𝕋⁻¹] × [𝕋]. It pairs with the Local Rhythm Quantum and connects to Pixel Quantization Principle, One Pixel = One Zinf, Zinf-Limit Universe, Minimal Radius Constraints and Pulse Diameter.