Polish model card prose: professional Kaggle status, limitations, guidance

Update model card: candid Kaggle status and troubleshooting narrative

Drop stale README backup

Remove legacy 72k checkpoint

Refresh with step119432 resume checkpoint

Fix model card: highlight real ARC task solve rate (2.92% pass@2)

Update model card: clarify full 100k training completed (step counter shows 72,385 due to restarts)

Upload README.md with huggingface_hub

Sync authorship note

Refine sponsor acknowledgement

Add sponsor acknowledgement

Add abstract and references

Update README.md

Add metadata front matter

Add files using upload-large-folder tool

initial commit