ADR-0087 exemption (no-migration-prescription): Nothing authorable moves: no spec key, Zod schema, export, config field or stored metadata shape is added, removed, renamed or re-spelled. The strict defineStack parse already refused every input this refuses, so an authored stack that passed its schema builds exactly as before; what narrows is the runtime behaviour of the strict: false door, and of composeStacks on hand-built inputs, on inputs that bypassed that parse, and objectstack migrate meta has no document to rewrite for it.