Quantum Structural Theory of Harmony (QSTH 8.7) — Lambda_lock Technical Note: From the Schrödinger Ledger of Possibility to Objective Settlement of Reality

This QSTH 8.7 working publication develops Lambda_lock as a technical candidate condition for the transition from coherent possibility toward stable record formation. The publication follows the QSTH 8.x sequence, especially QSTH 8.6.XS, where the Schrödinger equation was interpreted as a ledger of coherent possibility, and QSTH 8.6.XP, where Lambda_lock was introduced as a candidate threshold for objective settlement. QSTH 8.7 then asks the next technical question: what minimal structure is required for possibility to stop remaining only possible and become a stable, directionally readable record? Within this framework, Lambda_lock is not presented as a finished physical constant or confirmed law. It is introduced as a candidate lock condition, threshold window, and structured functional boundary. The publication also develops Gamma_lock as a candidate functional describing accumulated locking contribution over a finite transition window. A central modeling route is expressed as: integral Gamma_lock(t) dt >= Lambda_lock -> R_stable The text introduces several operational layers: candidate admissibility amplitude A_rec, the Gamma_lock integral, the Lambda_lock threshold condition, Sigma-wall and E_wall interface contributions, spin-locking contribution, gate-off null test, and the bridge toward Hessian settlement stability. The publication also emphasizes computability. Several components can already be explored as toy-models: threshold integrals, exponential rise and damping regimes, candidate non-Hermitian locking terms, gate-off limits, and later Hessian stability tests once a lock-potential or settlement landscape is defined. This text belongs to the QSTH 8.x working sequence. It is not presented as a confirmed physical theory, but as a structured conceptual, mathematical, and methodological technical note intended for future formalization, numerical testing, falsification, and comparison with null models. Additional candidate modeling relations used in this technical note include: A_rec = candidate admissibility amplitude Gamma_lock = candidate locking functional H_eff = nabla^2 Phi_lock H_eff > 0 -> stable settlement Gate-off / null test: Gamma_lock -> 0 These expressions are not presented as confirmed physical laws. They are structured candidate relations intended for future toy-model construction, numerical testing, falsification, and comparison with null models. Short description QSTH 8.7 develops Lambda_lock as a candidate technical lock condition for the transition from coherent possibility to stable record formation. It introduces Gamma_lock, A_rec, Sigma-wall, E_wall, spin-locking contribution, gate-off null testing, and the bridge toward Hessian settlement stability. Methodological status This publication is part of the QSTH CORE/CAND/SUPPORT/FUTURE framework. It should be read as a structured working publication, not as a confirmed physical model. Lambda_lock and Gamma_lock are candidate constructs. Their role is to provide a disciplined modeling language for future toy-model construction, numerical testing, falsification, and comparison with standard null models such as decoherence, open quantum systems, and non-Hermitian effective dynamics. Computability note Several parts of the proposed framework are already computable as toy-models. A candidate Gamma_lock function can be selected and integrated over a finite transition window. Threshold conditions of the form integral Gamma_lock(t) dt >= Lambda_lock can be numerically tested. Gate-off limits can be imposed by setting Gamma_lock to zero or by removing the proposed locking contribution. Candidate exponential, damping, growth, and phase-sensitive regimes can be compared against null models. These are not yet confirmed physical laws. They are structured modeling entry points for future numerical testing, falsification, and scientific collaboration. This record belongs to the QSTH 8.x publication sequence. It follows QSTH 8.6.XS — Schrödinger Equation as a Ledger of Possibility and QSTH 8.6.XP — Lambda_lock and Objective Settlement. QSTH 8.7 provides the technical bridge from the concept of possibility and objective settlement toward a structured candidate locking model. This publication prepares later QSTH branches on Spin-Locking and Structural Orientation, Schrödinger Equation with QSTH Locking Term, Hessian Geometry of Record Settlement, Entropic Genesis of Photon, and the later M-independent horizon framework. The publication includes a computability section and a gate-off / null-test discipline intended as an open invitation for future toy-model construction, numerical testing, falsification, and scientific collaboration. One-line public summary QSTH 8.7 introduces Lambda_lock as a candidate technical lock condition through which coherent possibility may become a stable, directionally readable record. Diamond sentence QSTH 8.7 does not claim that Lambda_lock is already a confirmed law. It defines the gate where such a law could begin to be modeled, tested, and possibly falsified.