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We present a systematic reconstruction of gravitational physics from a single informational axiom: physical regions possess finite boundary capacity, and localized energy imposes a measurable demand upon it. From three independently measured constants — the reduced Planck constant ħ, Newton's gravitational constant G, and the speed of light c — together with the pre-relativistic Michell (1783) saturation anchor, we derive the throughput field χ(r) = √(1 − 2κr/Σ), the operational propagation law v = cχ, gravitational time dilation, and the static Schwarzschild exterior sector. We then develop extensions to the Kerr exterior, frame dragging, gravitational-wave propagation, the Bekenstein–Hawking entropy formula, and the GPS clock correction — without invoking Riemannian geometry, tensor calculus, or Einstein's field equations as postulates. The framework is numerically consistent with selected benchmarks, including GPS drift (45.72 μs/day), GW150914 peak frequency, and Gravity Probe B frame dragging (42.16 mas/year, within the 37.2 ± 7.2 mas/year measurement). Remaining open challenges include the derivation of gravitational-wave tensor polarization modes and independent peer review. Keywords: throughput field, informational gravity, Kerr metric, frame dragging, gravitational waves, Lense–Thirring, GPS, Bekenstein–Hawking, Planck length derivation