link arXiv paper and update preferred citation

Clarify dataset access and training installation

Point website links to flexray.csail.mit.edu

Update FleXray paper title

Rename ThoracoaMonch evaluation split to PedsTorso

Remove MendeleyCXR (no longer part of the FleXray evaluation) and update README

Card: FluXray now ships in this repo; licenses listed per folder

Redistribute BTXRD (CC BY 4.0, figshare 27865398) in the fxr-dataset format

Add per-dataset split assignments and quality-control exclusions

Dataset card: describe FluXray inline

Dataset card: describe the FluXray companion release files

refine dataset citation and availability notes

update links and citation guidance

Add FleXray data release: 7 repackaged X-ray sources + MURA forearm/humerus annotations