Rename upgrade-samples to premium-samples; narrow to bent-over-db-row, drop evaluation-only restriction (part 3)

Rename upgrade-samples to premium-samples; narrow to bent-over-db-row, drop evaluation-only restriction (part 2)

Rename upgrade-samples to premium-samples; narrow to bent-over-db-row, drop evaluation-only restriction

Expand free tier to 400 exercises and add attribution snippets (part 2)

Expand free tier to 400 exercises and add attribution snippets

remove stale pre-free-tier classic-style images (flat-only free tier)

Upload folder using huggingface_hub (part 4)

Upload folder using huggingface_hub (part 3)

Upload folder using huggingface_hub (part 2)

Upload folder using huggingface_hub

Add RepDB exercise dataset (free 21-exercise sample)

initial commit