Justify license and add provenance (issue #148)

README.md

@@ -193,6 +193,15 @@ Pace-specific distinction between "research X" (multi-step) and
 "what is X" (single answer). FM also refused to answer one query
 ("model refused to answer").
 
+## License and provenance
+
+- Weights were trained from scratch by this repository's MIT-licensed
+  `train-extractor` code; no pre-trained or third-party weights are included.
+- Training data is a fully synthetic corpus generated by the repository's own
+  scripts (`pace/scripts/generate-intent-corpus-v2.py` and
+  `generate-intent-supplement-v2.py`); no external datasets or user data.
+- The package is therefore distributed under MIT, matching the repository.
+
 ## References
 
 - [Project and learning lab](https://posttrainllm.com)