Goldset corpus — licensing

TWO LAYERS, DELIBERATELY SEPARATE.

1. SOURCE EXCERPTS
   The `source_before`, `source_after` and `spec` fields contain excerpts from the
   projects named in each record. Those excerpts remain under their ORIGINAL
   licences (MIT, BSD-2-Clause, BSD-3-Clause, Apache-2.0, ISC, PSF-2.0), and are
   redistributed here under those terms with attribution preserved. Every record
   names its licence and links the exact upstream commit. See ATTRIBUTION.md for the
   complete list of source projects.

   Goldset claims no ownership over these excerpts.

2. THE ADDED LAYER
   Validation results, schema, fingerprints, structure and metadata produced by
   Goldset are released under Creative Commons Attribution 4.0 International
   (CC BY 4.0). https://creativecommons.org/licenses/by/4.0/

   THIS GRANT COVERS THIS RELEASE. It applies to the records published in this
   snapshot and stays in force for them permanently: nothing released here is
   ever withdrawn or relicensed. It is not a commitment about material that is
   not in it, including records mined after this snapshot, other languages, and
   any held-out set. Those are released, or not, on their own terms.

Only explicitly allow-listed permissive licences are shipped. Records whose licence
cannot be resolved with confidence are withheld rather than guessed at.

MAINTAINERS: if your project appears here and you would prefer it did not, write to
andy@goldset.dev or open an issue, and it will be removed. No questions asked.