DEC — Papers with Code registration became infeasible

Papers with Code registration became infeasible: PwC was absorbed by Hugging Face (paperswithcode.com redirects to huggingface.co/papers), so the project documents the migration honestly and pivots to arXiv/HF-card/GitHub discoverability.

Source: PUMA project documentation · Traceability: corpus unit ANXAG-047 · Confidence: verified-at-primary-source

Standalone atomic note — to be wired into its Map of Content during closure.