elementwise.rs: added abs, neg, exp, log, le, affine CUDA kernel ops
(cases 5-10 in elementwise_unary). All GPU-native, zero host downloads.
gpu_tensor.rs: 7 new methods — abs(), neg(), exp(), log(), le(),
affine(), broadcast_sub(). All dispatch to CUDA kernels.
dqn.rs: DELETED 30+ host-side helper functions (~455 lines) that
downloaded to CPU, computed, re-uploaded. ALL replaced with direct
GpuTensor methods: affine(), clamp(), abs(), neg(), exp(), log(),
broadcast_mul(), broadcast_sub(), broadcast_as(), index_select(),
dim(), sqr(), flatten_all(), gpu_clone(), ActivationKernels.
Zero host-side math remaining in dqn.rs hot paths.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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