ADR-0087 exemption (no-migration-prescription): An accept-set narrowing performed at the driver constructor: no key, spec symbol, Zod schema, object definition or stored representation is added, removed or renamed — `TursoDriverConfig.timeout`, `url` and `mode` keep their names and types, and `TursoConfigSchema` is untouched. What moves is which CONFIGURATIONS `new TursoDriver()` accepts — one predicate now compares the url's scheme case-insensitively, exactly as `@libsql/client` itself does before routing — so `objectstack migrate meta` has nothing to visit and there is no tombstone to mint. The refusal is the one the lowercase spelling already produces, naming the key, the scheme it met and both ways out; which of the two an author wants is authoring intent no ledger line can decide.