model: add NextN/MTP speculative decoding support for GLM_DSA (GLM-5.2) (#25980) model: add NextN/MTP speculative decoding support for GLM_DSA (GLM-5.2) Adds GLM-5.2 NextN/MTP as a --spec-type draft-mtp target: nextn tensor loading via the qwen35moe/step35-style presence probe, a graph_mtp builder (enorm/hnorm/eh_proj + dense MLA + sigmoid-gated MoE with shared expert + shared head with fallbacks, _s scale tensors passed for NVFP4), t_h_nextn extraction in the trunk graph, and MTP-context KV setup: the draft head runs dense MLA, so the MTP context uses a plain attention KV cache holding only the nextn layer(s) (same pattern as the hybrid Qwen3.5 MTP context) while the main context keeps the DSA cache, now filtered to trunk layers only.

Co-Authored-By: Claude Fable 5 convert : support --mtp/--no-mtp export for GlmMoeDsaForCausalLM (GLM-5.2) Opt GLM-5.2 into the supports_mtp_export contract (post-#25641 shape, mirroring HYV3Model/Step35Model): --no-mtp drops the appended NextN block (blk.78) and its nextn_predict_layers KV; --mtp keeps only the NextN block plus shared embeddings/norm/lm_head. Default (bundled) output is unchanged. Co-Authored-By: Claude Fable 5…