This final stack layer adds controlled Jev/Planner runners, browser and domain regressions, deployment checks, and the quality handoff documents. The tests separate unit and infrastructure contracts, real application behavior with PostgreSQL, and isolated external-model/network fixtures. The verification layer itself changes tests and documents; the reviewed stack also includes scoped fixes in the foundation, replay, and memory-storage layers.

The attached diagram shows those test boundaries and which results are complete. The [quality review guide](https://github.com/githubnext/chopin/blob/maggie/jev-verification/docs/jev-quality-review.md) records review findings and follow-up ownership; the [historical extraction inventory](https://github.com/githubnext/chopin/blob/maggie/jev-verification/docs/jev-product-source-map.tsv) preserves the earlier source mapping. Controlled fixtures make behavior repeatable; they do not establish live model quality.

**Validation:** On the locally rebased full stack, 3,552 Bun tests pass with three expected PostgreSQL-only skips and no failures; full workspace/E2E types and repository CI pass. The socket-binding tests require local port access and passed in the permitted environment. This layer's original PostgreSQL, contained Jev, and Chromium suites passed before the review fixes; all three required GitHub checks passed on the rebased head. This layer changes 101 files (+15,954/−45 lines).