ADR-0087 exemption (no-migration-prescription): No authorable key is renamed, retired or re-shaped for an author: `title` and `message` still take every non-blank bare string they took before, and now also the `template` envelope. The one newly refused input is a blank bare string (`''` or whitespace-only) at either key, and it was measured, not assumed. Census: the 31 files in this repo that author a `notify` node at the merge base (examples, docs, skills, the ADR, tests and fixtures) carry zero blank `title` / `message` values. The objectui pin (`a58626c8`) has 9 files that name a `notify` type and zero blank `title` / `message` literals. Not covered by either count: objectui's flow inspector deletes a cleared key only when the committed value is `''` (`setAtPath`), so a whitespace-only entry typed into the Studio form IS stored, and a stored flow carrying one is refused at its next run; hosted tenants' stored flows were not measured. No conversion can repair such a value, because an empty title or body has no intended text to recover: the remedy is authoring intent (write the text, or delete the key), so the ledger has nothing to rewrite.