ADR-0087 exemption (no-migration-prescription): The ADR-0087 ledger serves metadata upgraders: its entries are the data source for `objectstack migrate meta`, `spec-changes.json` and the generated upgrade guide. All ten names are ordinary TypeScript values and types on a published subpath with no metadata surface whatsoever — no Zod schema, no `packages/spec` declaration, no stored representation — so `objectstack migrate meta` has nothing to reach and no ledger entry could carry anything. There is also nothing to prescribe: the re-derived consumer reading found no importer of any of the ten, in this repo or in the one sibling checkout reachable, and the channel that would reach one is the compiler (TS2305 on the retired name), which is more precise than a ledger line.