Replace manual gradient reduction with DDP - #228
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The current multi-GPU path concatenates every gradient into one buffer before
all_reduce, which spikes VRAM on larger models. This PR usesDistributedDataParallelfor PPO and Distillation instead.broadcast_buffersis off so observation normalizers stay rank-local, same as today. Actor and critic share one wrapper soshare_cnn_encodersstill works.Fixes #163