fix(ml-dqn): migrate branching + regime_conditional — zero candle errors
branching.rs: MlDevice→Arc<CudaStream>, Candle gather/unsqueeze→host-side, MaybeNoisyLinear::noisy_sigma_slices(), copy_weights via memcpy pattern. regime_conditional.rs: device→stream field, all GpuTensor ops get &stream, batch_softmax_actions via host-side Gumbel-max, gradient merge via BTreeMap. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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