- Pre-allocate decode_out in InferenceWorkspace so attn_paged_decode does not call torch::empty inside graph capture
- Run live forward before graph capture to get valid output (graph pool memory is zeroed after capture block exits)
- Greedy generation with graph replay is bit-exact across all batch sizes
- _warmup_cuda_graphs pre-captures graphs at init for power-of-two batch sizes
- Graph enabled only when CudaBackend + supported head_dim + warmup succeeds
- Decode speedups vs no-graph: B=1 2.09x, B=4 1.80x, B=8 1.94x, B=16 1.76x
ViperEkura
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