Replace source collection with training-only dataset preparation

Record verified upload completion

Document completed public collection upload

Add collection provenance and build metadata

Add source-preserving NGen-4.5 merged collection

Document NGen-4.5 collection and source coverage

Publish validated collection metadata and storage blocker

Publish validated collection metadata and storage blocker

Publish validated collection metadata and storage blocker

Publish validated collection metadata and storage blocker

Publish validated collection metadata and storage blocker

Publish validated collection metadata and storage blocker

Publish validated collection metadata and storage blocker

Publish validated collection metadata and storage blocker

Document NGen-4.5 collection and source coverage

initial commit