Answer prose round 1 and product-owner round 1: give goal 5.7 a test a reader can apply, drop the AGENTS.md copy of it, and cite the key decision to goal 5.5

README.md

@@ -958,8 +958,9 @@ Where the project is heading; the sections before Audience document what ships t
    5. `[SE]` selects one row of a table, and means that row wherever you write it.
    6. If two people could read a template differently, loading it fails, and the
       error shows how to write each meaning.
-   7. Each result has one obvious way to write it. A spelling that only restates another
-      fails to load, and the error shows the obvious one.
+   7. Each result has one obvious way to write it. A spelling with a part that doesn't
+      change anything — a default written out, a repeated item, a wrapper around what
+      could stand alone — fails to load, and the error shows it without that part.
    8. When a clearer name turns up, it replaces the old one, even if that needs a new
       major version.
 6. **Mistakes are caught when the data loads, and the error says plainly what is