MarinFold exp75 checkpoints

Final checkpoints from the MarinFold contacts-v1 1.5B tuning sweep tracked in Open-Athena/MarinFold#75.

Both checkpoint formats are retained:

hf/ contains a Qwen3ForCausalLM Hugging Face safetensors export with the contacts-v1 tokenizer colocated with the weights.
checkpoints/ contains the original Levanter OCDBT checkpoint for training restart or re-export.

Checkpoint inventory

Run ID	Final step	Format	Repository path	GCS source
`prot-exp75-cv1-1_5b-e8-lr1e-3-wd0p2-v1-bc3084`	35679	Hugging Face	`hf/step-35679`	`gs://marin-us-east5/checkpoints/prot-exp75-cv1-1_5b-e8-lr1e-3-wd0p2-v1-bc3084/hf/step-35679/`
`prot-exp75-cv1-1_5b-e8-lr1e-3-wd0p2-v1-bc3084`	35679	Levanter	`checkpoints/step-35679`	`gs://marin-us-east5/checkpoints/prot-exp75-cv1-1_5b-e8-lr1e-3-wd0p2-v1-bc3084/checkpoints/step-35679/`

W&B recorded this run as finished at step 35,679. The GCS run contains exactly one permanent Levanter checkpoint, also at step 35,679.

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