Add the entropy-valley project tag so the repos are discoverable by the paper/project name

Link the arXiv preprint (arXiv:2608.22274): header link, BibTeX eprint fields, and the arxiv YAML tag

Align the card with the EMNLP 2026 camera-ready (entropy over L-1 slots, candidate formula, at-most-five probes, grid provenance, runs not seeds, author order)

Card: mark the arXiv link as pending

Initial release for 'Length-Adaptive Decoding for Masked Diffusion MT' (EMNLP 2026)