Integrate NeMo Automodel Qwen3.5-35B-A3B recipe with MFSDP v2

## Summary

The NeMo Automodel Qwen3.5-35B-A3B VLM fine-tuning recipe currently uses PyTorch FSDP2 and needs a validated Megatron Core path using experimental MFSDP v2.

Reference recipe:
- https://github.com/NVIDIA-NeMo/Automodel/blob/main/examples/vlm_finetune/qwen3_5_moe/qwen3_5_35b.yaml

## Reproduction / starting point

The reference recipe runs with:

```bash
automodel examples/vlm_finetune/qwen3_5_moe/qwen3_5_35b.yaml --nproc-per-node 8
```

Use the same model and the closest equivalent data, parallelism, and checkpoint settings through the MFSDP v2 path.