frank-medium: swap the drafter to magnitudedev/Qwen3.8-27B-DSpark

DSpark (Q8_0, 1.27 GiB) replaces z-lab DFlash2 (1.92 GiB): same 5-layer
block-diffusion shape, Markov head instead of the candidate selector, and
block_size 7, so the draft depth drops 7 -> 6 (llama.cpp asserts
n_max <= block_size - 1).

The serve script's dspark branch never passed --spec-draft-model (only the
dflash branch did), so dspark was not deployable as written; the model file
gate now covers both types. Download script, env and the unit seam track the
new file and its exact byte count.

scripts/frank-medium.env

@@ -1,5 +1,5 @@
 # Tunables for frank-medium (ajgazin/Swift-Qwen3.8-27B-Uncensored-Dynamic-MTP
-# UD-Q8_K_XL + z-lab/Qwen3.8-27B-DFlash2-GGUF Q8_0 drafter), mainline llama.cpp
+# UD-Q8_K_XL + magnitudedev/Qwen3.8-27B-DSpark-GGUF Q8_0 drafter), mainline llama.cpp
 # on Dankserver, 2x AMD Radeon AI PRO R9700 (gfx1201).  Since 2026-09-16 this
 # is the SOLE LLM runtime on the box: the vllm-radiance replica pair and its
 # routing proxy are retired.
@@ -39,9 +39,9 @@
 # carries the model's MTP head (blk.64.nextn.*), so a file-level switch to
 # --spec-type draft-mtp is available without a second copy in VRAM.
 #
-# Drafter: z-lab/Qwen3.8-27B-DFlash2-GGUF @ Q8_0, 1.92 GiB: 5 layers, hidden
-# 5120, block-diffusion proposal with the candidate selector.  Decoding stays
-# lossless -- the target verifies every drafted token.
+# Drafter: magnitudedev/Qwen3.8-27B-DSpark-GGUF @ Q8_0, 1.27 GiB: 5 layers,
+# hidden 5120, block-diffusion proposal with the Markov head (dspark).
+# Decoding stays lossless -- the target verifies every drafted token.
 #
 # Architecture (GGUF arch qwen35): 64 layers as 16 x (3 x (Gated DeltaNet ->
 # FFN) + 1 x (Gated Attention -> FFN)) -- 48 linear-attention layers whose
@@ -74,8 +74,8 @@ LLAMA_BIN=/home/dank/GitPackages/llama.cpp-dflash2/build-rdna4-rocm714/bin/llama
 # Payload, fetched with scripts/download-frank-medium-gguf.sh.
 MODEL_DIR=/home/dank/models/Swift-Qwen3.8-27B-Uncensored-Dynamic-MTP-GGUF
 MODEL_FILE=Swift-Qwen3.8-27B-Uncensored-Dynamic-MTP-UD-Q8_K_XL.gguf
-DRAFT_MODEL_DIR=/home/dank/models/Qwen3.8-27B-DFlash2-GGUF
-DRAFT_MODEL_FILE=Qwen3.8-27B-DFlash2-Q8_0.gguf
+DRAFT_MODEL_DIR=/home/dank/models/Qwen3.8-27B-DSpark-GGUF
+DRAFT_MODEL_FILE=Qwen3.8-27B-DSpark-Q8_0.gguf
 
 # Fleet identity.  7770 is the fleet's dankserver endpoint; the alias is the id
 # at /v1/models and what every client asks for.
@@ -137,15 +137,13 @@ REASONING_BUDGET=-1
 CHAT_TEMPLATE_FILE=
 CHAT_TEMPLATE_KWARGS='{"enable_thinking":true,"preserve_thinking":true}'
 
-# Speculative decoding: the DFlash2 block-diffusion drafter PLUS the draftless
-# n-gram matcher. Measured against the drafter alone on 2026-09-16 (tables
-# below): the chain is byte-identical to DFlash2 by itself where n-grams cannot
-# match, and ~2.6x it where they can. DFlash2's GGUF carries block_size 8, so at
-# most 7 draft tokens per verification step (llama.cpp asserts
-# n_max <= block_size - 1); 7 is also what the drafter was published with. The
-# drafter rides ROCm1, the card that ends up holding the target's last layers.
-SPEC_TYPE=draft-dflash,ngram-mod
-SPEC_DRAFT_N_MAX=7
+# Speculative decoding: the DSpark block-diffusion drafter PLUS the draftless
+# n-gram matcher. DSpark's GGUF carries block_size 7, so at most 6 draft
+# tokens per verification step (llama.cpp asserts n_max <= block_size - 1).
+# The drafter rides ROCm1, the card that ends up holding the target's last
+# layers.
+SPEC_TYPE=draft-dspark,ngram-mod
+SPEC_DRAFT_N_MAX=6
 SPEC_DRAFT_NGL=999
 SPEC_DRAFT_DEVICE=ROCm1
 SPEC_DRAFT_TYPE_K=f16