The Preonic Universe as a Gravitationally Coupled Computational System: Instantaneous Feedback Amplification, Algorithmic Constraints, Computational Capacity, and Observational Gravitational Tomography

Quantum-Geometry Dynamics (QGD) establishes on two independent grounds that quantum computational speedup is physically precluded: ontological superposition does not exist in the preonic universe, and gate operations are irreversible causal events from which no exponential parallelism can be extracted. The same axiomatic structure that forecloses quantum computation mandates a categorically different computational substrate. Because gravity in QGD is instantaneous, unshieldable, and amplified — not attenuated — at cosmological distances through the n-gravitational interaction G⁻(a;b) = mₐ·mₕ·(d²+d)/2, the finite preonic universe constitutes a naturally occurring gravitationally coupled computational system. This paper derives the Gravitational Feedback Amplification Theorem (GFAT): any locally encoded causal signature σ can be raised above the gravitational background noise in a finite number of feedback cycles, with causal depth fixed at 2 per cycle regardless of spatial separation. - Observational Gravitational Tomography: the amplified return signal carries information about the mass, spatial separation, and directional position of all participating cosmological masses — accessible in real causal time, unlike electromagnetic observation, which is limited to the past state of distant objects. - Compatible algorithm classes: identified and characterised against the physical write and read mechanisms — controlled photon delivery to nuclear and electronic targets — that implement encoding and readout. - Comparative capacity analysis: the computational capacity of the gravitational channel is compared directly with classical architectures and projected quantum devices.