- `[2026-07-14]` **NVFP4+MTP fast char-rp-reasoning seat LANDED + LIVE + gateway-repointed + VRAM-tuned.** Modelopt-format re-quant made MTP work. The load-crash root cause = **vLLM 0.24 does NOT propagate modelopt `exclude_modules` to the spec-decode DRAFT model** → the bf16 mtp head gets quantized → shape crash; NO checkpoint config fixes it (`is_layer_skipped` is exact-membership, and the drafter never sees the mtp excludes) → **workaround = a mounted `sitecustomize` that force-skips `mtp.*` in `is_layer_skipped`** (upstream vLLM bug to file). Productionized as compose stack `heretic2-charrp-reasoning` (:8018, workaround baked in). Gateway `char-rp-reasoning` alias fixed: repointed off the stale GGUF served-name `deckard-pkd-27b`, added `enable_thinking:true`, **dropped `min_p`** (MTP-incompatible), canonical samplers temp1.0/top_p0.95/top_k20. Rebalanced GPU0 (gen 0.37→0.30/16-seq/256K + reasoning 0.39/16-seq/192K+MTP + char-rp 128K, 2.7GB free). All 4 gateway roles verified; vLLM reasoning-parser confirmed **leak-free** (unlike the GGUF budget-forcing). Full record + the 4 quant landmines in `docs/runbooks/heretic2-nvfp4-mtp-seat.md`; committed `982c319`. Open (non-blocking): brokkr P00 (seat is live ahead of it), retire the stopped GGUF reasoning seat, file the vLLM bug.