Writes a commented format.yml starter, seeded from an existing style so you
change only what differs.
Arguments
- id
New style id.
- from
Existing style to copy tokens from.
- path
Destination directory (a style bundle folder is created inside).
- complete
If
TRUE(default), scaffold every token in the schema, one flat dotted key per line, as an editable reference. IfFALSE, seed only the tokens the source style actually declares.