Keep in a pick only what reads of its name address, look frames up on the stack alone, and refuse a name read once whole

CHANGELOG.md

@@ -13,10 +13,12 @@ replacement, and each removed path, column or flag.
   A name lives in the category binding it, so every field and record column of the
   category reads one pick, a transform reads it as `{lowercase(t.name)}`, and a name a
   `repeat` binds picks again on every iteration. Refused at `New`: a name bound twice
-  outside any `repeat`, twice in one `repeat`, or both inside a `repeat` and outside it; a name that is a field or an option;
-  a binding of anything but a reference; a binding in a choice's item; a binding nothing
-  reads; a path through a name that selects a row; and a binding in a table. A field,
-  column, category or folder name may not contain ` as `.
+  outside any `repeat`, twice in one `repeat`, or both inside a `repeat` and outside it; a
+  name that is a field or an option; a binding of anything but a reference; a binding in a
+  choice's item; a binding nothing reads, or one read once whole, which the reference
+  spells; a path through a name that selects a row; a read of a name rendering a field
+  twice where a path through the name reads it; and a binding in a table. A field, column,
+  category or folder name may not contain ` as `.
 - First release: the CLI, the library and the shipped data set.
 - Table categories: a category JSON naming a `rows` TSV beside it, with the options
   `key`, `name`, `weight` and `parent`; a path selects a row by key or name,