frank-default-small: enable tool calling (--enable-auto-tool-choice --tool-call-parser qwen3_xml)

Clients send tool_choice=auto; without these flags vLLM rejects with
HTTP 400. The Avesed chat template renders the Qwen3 XML tool format,
so qwen3_xml is the matching parser.

scripts/serve-frank-small.sh

@@ -33,12 +33,20 @@ fi
 : "${NGRAM_LOOKUP_MAX:=5}"
 : "${NGRAM_LOOKUP_MIN:=1}"
 : "${NUM_SPEC_TOKENS:=5}"
+: "${ENABLE_AUTO_TOOL_CHOICE:=1}"
+: "${TOOL_CALL_PARSER:=qwen3_xml}"
 
 if [[ ! -x "$VLLM_BIN" ]]; then
     echo "missing vllm binary: $VLLM_BIN" >&2
     exit 1
 fi
 
+TOOL_ARGS=()
+if [[ "${ENABLE_AUTO_TOOL_CHOICE}" == "1" ]]; then
+    TOOL_ARGS+=(--enable-auto-tool-choice)
+    TOOL_ARGS+=(--tool-call-parser "${TOOL_CALL_PARSER}")
+fi
+
 exec "$VLLM_BIN" serve "$MODEL" \
     --host "$BIND_ADDR" \
     --port "$LISTEN_PORT" \
@@ -50,4 +58,5 @@ exec "$VLLM_BIN" serve "$MODEL" \
     --gpu-memory-utilization "$GPU_MEMORY_UTILIZATION" \
     --speculative-config "{\"method\":\"ngram\",\"prompt_lookup_max\":$NGRAM_LOOKUP_MAX,\"prompt_lookup_min\":$NGRAM_LOOKUP_MIN,\"num_speculative_tokens\":$NUM_SPEC_TOKENS}" \
     --reasoning-parser qwen3 \
-    --trust-remote-code
+    --trust-remote-code \
+    "${TOOL_ARGS[@]}"