Semantic Observers: A Functional Criterion for Observer-Systems in the Quantum Measurement Problem

This version substantially revises the previously published draft. The main changes are: β is now derived rather than merely interpreted, through a constrained-inference/Landauer budget relation ∫₀^β Varₛ (Gcmp) ds = η Wᵢₙₛₜ, ₜₒₜ / (kB T) measurement is placed inside a deeper forward-actionability layer, with grounded measurement, decoupled semantic action, and ungrounded semantic action treated separately; reconciliation is reformulated using localized relativistic comparison components rather than any universal update surface; measurement influence is modeled through a causal interaction-space kernel K; grounding/provenance tension is corrected into an entropic, comparison-exposed quantity preserving Local Born Invariance and Operational No-Signalling; and the paradox analysis is expanded to include EPR/steering, Bell, Kochen–Specker, GHZ, Hardy, Leggett–Garg, PBR, Renninger, Elitzur–Vaidman, and Zeno-type effects. The framework is also made explicitly interpretation-agnostic: decoherence, quantum Darwinism, RQM, QBism, decoherent histories, and active inference enter only as contact points or case studies. The resulting thesis is that forward actionability is structurally prior to measurement, measurement is grounded actionability, semantic observation is reconfigurable actionability, and shared classical facthood is the costly admissible gluing of local records, actionable reports, and consequences across causal comparison components.