Activations: ml-ppo/cuda_nn/activations.rs 208→60 lines (-71%).
Deleted 4 inline CUDA kernels, replaced with thin wrappers delegating
to ml-core::cuda_autograd::ActivationKernels via new _raw methods.
AdamW: Unified kernel source between ml-ppo and ml-core. Switched to
architecture-aware SASS compilation (compile_ptx_for_device). Fixed
weight decay from L2-regularization to true decoupled AdamW formula.
Added GpuTensor::into_parts() for zero-copy CudaSlice extraction.
Added ActivationKernels::relu_fwd_raw/bwd_raw/tanh_fwd_raw/sigmoid_fwd_raw
for direct CudaSlice operation without GpuTensor wrapping.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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