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/download-frank-medium-gguf.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # Download the frank-medium payload for Dankserver (2x Radeon AI PRO R9700):
-# the target GGUF and the DFlash2 draft model, into /home/dank/models.
+# the target GGUF and the DSpark draft model, into /home/dank/models.
 #
 #   bash scripts/download-frank-medium-gguf.sh
 #   bash scripts/download-frank-medium-gguf.sh --verify-only
@@ -17,10 +17,10 @@
 #     own quant of the same size, on Unsloth's importance matrix).  The file
 #     carries the model's MTP layer (`blk.64.nextn.*`), so llama.cpp can also
 #     draft from the model itself with no second copy in VRAM.
-#   * Draft: z-lab/Qwen3.8-27B-DFlash2-GGUF at Q8_0 -- the block-diffusion
-#     drafter with the candidate selector (5 layers, hidden 5120).  Q8_0 is
-#     2.0 GiB against BF16's 3.9 GiB and the drafter's job is throughput, not
-#     output quality (verification is lossless either way).
+#   * Draft: magnitudedev/Qwen3.8-27B-DSpark-GGUF at Q8_0 -- the
+#     block-diffusion drafter with the Markov head (5 layers, hidden 5120,
+#     block_size 7).  Q8_0 is 1.27 GiB against BF16's ~2.5 GiB and the
+#     drafter's job is throughput, not output quality (lossless verification).
 set -euo pipefail
 
 MODEL_REPO="ajgazin/Swift-Qwen3.8-27B-Uncensored-Dynamic-MTP-GGUF"
@@ -28,10 +28,10 @@ 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"
 MODEL_SIZE=31457990112
 
-DRAFT_REPO="z-lab/Qwen3.8-27B-DFlash2-GGUF"
-DRAFT_DIR="/home/dank/models/Qwen3.8-27B-DFlash2-GGUF"
-DRAFT_FILE="Qwen3.8-27B-DFlash2-Q8_0.gguf"
-DRAFT_SIZE=2056414816
+DRAFT_REPO="magnitudedev/Qwen3.8-27B-DSpark-GGUF"
+DRAFT_DIR="/home/dank/models/Qwen3.8-27B-DSpark-GGUF"
+DRAFT_FILE="Qwen3.8-27B-DSpark-Q8_0.gguf"
+DRAFT_SIZE=1359284737
 
 mode="download"
 [[ "${1:-}" == "--verify-only" ]] && mode="verify"