Add 3,571 training PDFs (1,786 poster + 1,785 non_poster) matched to poster_sentry_train.ndjson

Add AI-generated disclosure to image hover text

Add cross-references to GitHub repos

Soften verbiage: posters are repository-labeled, not individually verified

Updated README — logo, related models, methodology, grant acknowledgment

Upload poster_sentry_train.ndjson with huggingface_hub

Upload README.md with huggingface_hub

initial commit