Twenty versions. One sealed substrate.

The scanner that produced the v13.1.0-production-day-zero-full sealed snapshot is the result of a documented development lineage spanning twenty versions across three months. The lineage organises into three eras and one corrective iteration. The v11.1 era produced the historical baseline of 511 institutions used by the first three working papers in the corpus. The v11.1.1 attribution overlay introduced cryptographic provenance at every pipeline stage. The v12.1.1 production scanner was certified through capture-replay validation on an anonymised G-SIB. The v13 corrective iteration tested four targeted interventions: v13.0.0 cleanly falsified one of them, v13.1.0 retained the three confirmed interventions and replaced the falsified one with a minimalist counterpart. Two negative controls in the lineage, the v11.0 edge compression bug and the v12.0 silent-degradation parser failure, each produced directionally predictable output changes upon correction. The instrument responds to known interventions in the predicted direction at the predicted magnitude. That is the structure of a validated measurement.