cuBLAS requires M/N/K dimensions to be multiples of 8 for BF16 tensor
core dispatch. state_dim=51 (with OFI) caused silent fallback to scalar
FMA ops, leaving tensor cores at 0.1% utilization despite BF16 enabled.
Pad state_dim to next 8-multiple (51→56, 43→48) at network construction
and zero-pad input tensors in forward pass across all DQN network types:
Sequential, DuelingQNetwork, DistributionalDuelingQNetwork, NetworkLayers.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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