Delete v2-samelayer after rename (3/14)

v2-samelayer/assembled_activations/qwen3-4b-ppo/checkpoints/final.pt

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v2-samelayer/assembled_activations/qwen3-4b-ppo/metrics/aggregate_metrics.json

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v2-samelayer/assembled_activations/qwen3-4b-ppo/metrics/training_metrics.json

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