Joint-context LoopViT

Fresh joint-context ARC model: all demonstrations and the query share attention. Not an upstream checkpoint or paper reproduction. Check metrics.jsonl for completed optimizer updates; compilation is not training. Checkpoints are saved on the remote Trainium host and uploaded here, not downloaded to the workstation. Dataset policy and sources are in manifest.json. Spatial ConvGLU: False. Dataset policy: all-public-kaggle-only. With all-public training, local metrics are training diagnostics, not a benchmark. Snapshots are 300-DPI PNGs plus vector SVGs. Epochs: 100; sampling: shuffled without replacement. Epoch checkpoints preserve the permutation and cursor.