Link the demo Space from the model card

Card images as WebP: 1.24 MB -> 0.25 MB

Replace the 4.6 MB GIF with a 148 KB MP4 (plus poster)

Model-only repository: weights, config.json and model card; code lives on GitHub

Inference-only code: remove training, evaluation and experimental code

Model-focused card; release scope: EN-GJS-400-15 + G20Mn5, green sand; mesh-in API

Point to the renamed GitHub repo; keep the project title

Release v5.1: CastSolid GNN casting solidification surrogate (Apache-2.0)