frank-default-large: ngram-mod only — both MTP draft heads incompatible

Both the EasiiX Q8_0 and agentionai ROCmFP4-FAST MTP draft heads fail
with 'missing tensor blk.0.hc_attn_norm.weight' against the STRIX_LEAN
Uncensored model. The qwen4exp binary expects this hyper-connection
attn norm tensor which neither draft GGUF carries. Using ngram-mod
only until a compatible MTP head is found.

scripts/serve-frank-large.sh

@@ -21,11 +21,11 @@
 # hyper-connection/indexer configuration; -ngl 999 places all layers on
 # the GPU (SVM-backed).
 #
-# MTP draft head: agentionai/Qwen3.8-Flash-Next-MTP-ROCmFP4-FAST-GGUF
-# (ROCmFP4-FAST, 2.28 GiB).  Speculative decoding via --spec-type
-# draft-mtp,ngram-mod (n_max 3, p_min 0.75).  The earlier EasiiX Q8_0
-# draft was incompatible (missing blk.0.hc_attn_norm.weight).  Set
-# SPEC_TYPE=none in the env to disable spec decoding.
+# MTP draft head: both attempted heads (EasiiX Q8_0 and agentionai
+# ROCmFP4-FAST) are INCOMPATIBLE with the STRIX_LEAN model — the
+# qwen4exp binary expects blk.0.hc_attn_norm.weight which neither
+# draft GGUF carries.  Using ngram-mod only.  Set SPEC_TYPE=none in
+# the env to disable spec decoding.
 #
 # The Qwen-Sharp chat template (scripts/chat-template.jinja) is applied at
 # runtime so the model emits reasoning in DeepSeek format; the reasoning
@@ -69,7 +69,7 @@ fi
 : "${REASONING:=on}"
 : "${REASONING_FORMAT:=deepseek}"
 : "${HSA_OVERRIDE_GFX_VERSION:=11.5.1}"
-: "${SPEC_TYPE:=draft-mtp,ngram-mod}"
+: "${SPEC_TYPE:=ngram-mod}"
 : "${DRAFT_MODEL_DIR:=$MODEL_DIR}"
 : "${DRAFT_MODEL_FILE:=Qwen3.8-Flash-Next-MTP-ROCmFP4-FAST.gguf}"
 : "${SPEC_DRAFT_N_MAX:=3}"