ADR-0087 exemption (no-migration-prescription): nothing authored or stored moves: no authorable key, no Zod schema and no stored `sys_metadata` shape changes — `packages/spec` declares no response schema for this face at all, so `objectstack migrate meta` has nothing to visit, `spec-changes.json` has nothing to project and the upgrade guide gains no row. What moves is one optional member on an inline TypeScript response type of a runtime protocol method, and the channel that reaches every affected consumer is the compiler at their own call site, which names the site more precisely than a ledger line could. The `packages/spec` file in this diff is a `.describe()` STRING — customer-facing prose that this change would otherwise leave false — not a schema, a key or an accept set; nothing it declares moves.