Block a user
qwen4_exp D: QSA sparse-attention indexer
The indexer is implemented; two findings need an answer before the layer is wired
On feat/qwen4-exp-qsa-indexer (CI running): the block selection
(BlockSelector), the layer around it…
qwen4_exp E: hyper-connections, PLE n-gram embeddings, interleaved M-RoPE
Progress: the new maths is in; what is left is wiring
Four of E's five items are on main or in review. None of them are
reachable yet — there is no qwen4_exp config or decoder to call…