Add ViT-Mini DFA training script that saves checkpoint + Bs

The existing snapshot_evolution_vit.py and vit_frozen_blocks_baseline.py
do not save model checkpoints — they only emit per-epoch JSON logs. This
makes it impossible to apply the diagnostic protocol to a trained ViT
post-hoc, since the protocol needs an actual model object.

This script trains a 4-block d=128 ViT-Mini with block-level DFA on
CIFAR-10 (same training rule as snapshot_evolution_vit.py) for 60 epochs
and saves:
  - the final state_dict
  - the random feedback Bs (so the protocol can also verify bug 4 on
    this checkpoint)
  - test_acc and config

Output: results/vit_dfa_checkpoints/dfa_vit_s{seed}.pt

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