CE_2 Fixation as Licensing Under Constraint Envelopes

This paper establishes fixation as a licensing condition imposed by constraint envelopes, rather than as a physical, causal, or epistemic process. Fixation is shown to be the structural act by which a representational choice becomes admissible within an envelope, enabling stable reference without invoking dynamics, collapse mechanisms, or observer-dependent intervention. The argument is necessity-based and eliminative. It demonstrates that fixation cannot be gradual, emergent, or externally imposed, and that treating fixation as a process inevitably introduces illicit redescription or hidden scope transport. Once constraint envelopes are enforced, fixation appears only as a boundary condition on admissible representation, not as something that happens in time. The result clarifies why measurement-like phenomena do not require additional postulates, why reference stability is envelope-relative, and why attempts to model fixation mechanistically overstep admissibility. The paper introduces no new primitives and provides no operational procedures; it records fixation as a structural requirement for admissible standing within any coherent representational regime.