Physics from Finite Validation: Classical Recovery and the Quantum Boundary

We develop a foundational framework in which physical structure arises from a single constraint: validation is transmitted, and transmission is finite. Treating the world as a self-validating system of mutually-confirming functional structures, we show that a finite transmission limit is not an added postulate but a condition for events to be distinguishable at all. From this limit the classical sector is recovered: the Lorentz factor from interception geometry, gravitational time dilation without fitting, the full relativistic light deflection (1.750 arcsec) as the sum of two equal channels, the 1/r^2 profile as compatibility with three dimensions, an effective gravitational attraction emerging from synchronisation dynamics, and the form of E=mc^2. The novelty lies in the grounding, not in the numbers, and the quantitative Newtonian limit is left open. The quantum sector is given a coherent interpretation with its boundary explicitly marked. Genuine randomness is read as the operational inaccessibility of cause under limited temporal resolution; superposition as the absence of position prior to an act of mutual validation; measurement as that binary act. Within this reading we offer a geometric reconstruction of the Tsirelson factor 2-root-2 under an explicit closure-point hypothesis (the bound of 2 derived from binarity, the factor root-2 from a Pythagorean path under party symmetry), reinterpret the Born quantity as a degree of constructedness rather than a frequency, and ground the structure of the observable quantum on the proven value indefiniteness of Kochen-Specker. The junction with gravity is demarcated through a genuine/false-quantum distinction rather than solved. We do not claim to derive the Tsirelson bound, replace the Born rule, or quantise gravity; each such item is marked as interpretation, hypothesis, or open debt. All simulation code is openly available.