[erikshafer]

Doc-only. The 2026-09-07 mock audience synthesis restated the skeptic review's 2026-09-04 finding that the after twin lacked a unique index on Cake.Name. That index already ships: Audit Tier 2 (b24a723, PR #5) added opts.Schema.For<Cake>().UniqueIndex(UniqueIndexType.Computed, x => x.Name) to the after twin's Program.cs, and the 2026-09-05 hardening added the shared database_refuses_duplicate_cake_name_behind_the_api scenario that goes red if either twin loses its index. Adding the statement again would register the same index twice, so no code changed.

Re-verified this session and recorded in docs/build-log.md:

• SeedData seeds three distinct cake names.
• The contract fixture builds the index on every fresh Testcontainers database via ApplyAllConfiguredChangesToDatabaseAsync.
• The existing compose volume already carries after.mt_doc_cake_uidx_name (Marten's default AutoCreate.CreateOrUpdate patched the table on 2026-09-05); no down -v needed for the live demo.
• Suite 54/54 (27 scenarios x 2) and unit tests 15/15, 0 warnings.
• Whole-twin counts by the inventory's rule, unchanged: before 2,140 raw / 1,775 non-blank, after 703 / 581. The index and its comment have been inside the after twin's number since 2026-09-04, so the deck's scorecard keeps 703 / 581.

No change to src/, openspec/, docs/file-inventory.md, or the README.