Mark dataset as public preview

README.md

@@ -27,10 +27,11 @@ uses the `sraimund/MapPool` head with the OpenCLIP
 
 ## Licensing and release status
 
-This repository is initially private so the media, provenance, attribution, checksums,
-and predictions can be reviewed before public release.
+This repository is a public preview so the media, provenance, attribution, checksums,
+predictions, and annotation workflow can be reviewed end to end.
 
 The original annotation tooling is MIT-licensed and annotation records default to
 CC BY 4.0. Those licenses do **not** relicense the source figure media. Before changing
-this dataset to public, record the applicable BRGM redistribution statement and
-attribution, and record the MapPool code/weight usage terms.
+reusing this dataset, consult the applicable BRGM public-document statement and
+attribution. MapPool predictions are distributed as metadata only; no MapPool or
+OpenCLIP model weights are included.