pub fn atoms_flat() -> Option<(Vec<f32>, usize, usize)>Expand description
Flatten the installed atoms into the arena layout [layer][K atoms n_atoms×head_dim][V atoms …],
with (flat, n_atoms, head_dim); layers/streams with no dictionary are zero (never selected). The
engine uploads this into the tail of each layer’s KV-arena slice for the GPU shader to reconstruct.