frank-default-small: disable speculative decoding to keep 3 slots

ik_llama limits speculative decoding to a single server slot (-np 1) and
hard-exits at load if a spec stage is configured with --parallel > 1:
"Speculative decoding is currently limited to a single server slot
(-np 1)." This service keeps PARALLEL=3 (one slot per user), so set
SPEC_TYPE=none to disable speculation. It is a low-parameter MoE (3B
active of 35B), so throughput is fine without it. MTP stays disabled.
KB and tests updated.

scripts/serve-frank-small.sh

@@ -4,8 +4,9 @@
 # experts on CPU).
 #
 # Runtime: ik_llama.cpp llama-server (ikawrakow ik_llama.cpp). The model is a
-# 35B-total / 3B-active MoE-dense hybrid with an MTP head bundled in the GGUF;
-# this service uses ngram-mod instead of MTP speculation.
+# 35B-total / 3B-active MoE-dense hybrid with an MTP head bundled in the GGUF.
+# Speculative decoding is disabled: ik_llama limits any spec stage to a single
+# server slot (-np 1), and this service keeps 3 parallel slots.
 #
 # KV cache: q8_0 with Hadamard transforms on K and V (requires a build with
 # GGML_CUDA_FA_ALL_QUANTS=ON + GGML_IQK_FA_ALL_QUANTS=ON; see the env file).
@@ -21,7 +22,9 @@
 # final output-adjacent blocks stay on CUDA with all non-expert tensors,
 # without relying on MTP speculation.
 #
-# Speculative decoding: ngram-mod only. MTP is intentionally disabled.
+# Speculative decoding: disabled (none). ik_llama hard-exits if a spec stage
+# is configured with --parallel > 1. MTP is also intentionally disabled.
+# A low-parameter MoE (3B active) does not need speculation here.
 #
 # Tunables come from frank-default-small.env unless FRANK_SMALL_ENV_FILE
 # overrides that path.
@@ -47,7 +50,7 @@ fi
 : "${LISTEN_PORT:=7770}"
 : "${CTX_SIZE:=491520}"
 : "${PARALLEL:=3}"
-: "${SPEC_TYPE:=ngram-mod:n_min=48,n_max=64,ngram_size_n=24}"
+: "${SPEC_TYPE:=none}"
 : "${CACHE_TYPE_K:=f16}"
 : "${CACHE_TYPE_V:=f16}"
 : "${K_CACHE_HADAMARD:=0}"