Reference schema in output file

If the schema is linked in the output json, tools and text editors may directly validate against this schema. It also is a way of documenting the compliance / structure source.

However, for this we need a stable, maybe versioned schema reference first.

Start by locating the schema definition and the code that generates the output JSON; the issue does not name specific files or tests. First establish a stable, possibly versioned schema reference, then verify that generated output links to it and that tools or text editors can use the link for validation.

Written by the indexing model from the issue text.