Answer architecture round 4, stability round 3, product-owner round 3 and prose round 2: stdin trims JSON's own whitespace around any JSON value, the padded-JSON title names NewTemplate and the CLI, the JSON examples hold no backslash for echo, an argument's example is built only from a template or a valid reference and shell-quoted, the text scope of adding nothing, blank stdin, and the stdin decision in four paragraphs

CHANGELOG.md

@@ -28,10 +28,10 @@ replacement, and each removed path, column or flag.
   under [Names](README.md#names).
 - First release: the CLI, the library and the shipped data set.
 - The CLI renders exactly the template on its stdin, `echo '{/sv_SE.person} hihi' |
-  fejkdata`, and adds nothing: `echo`'s newline ends the render, and `--separator`
+  fejkdata`, and adds nothing to text: `echo`'s newline ends the render, and `--separator`
   defaults to empty. Whitespace around a JSON template is dropped. A lone reference,
   `{/users}`, is the record `users` under `--format`. An argument other than a flag, an
-  empty stdin, or nothing piped in, exits 2.
+  empty or blank stdin, or nothing piped in, exits 2.
 - 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,
   `misc.territory[SE]`, and descends to a linked table by name, one path drawing each