adds test harness

test/threadx/run_threadx_simple_test.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+set -euo pipefail
+
+simulator="$1"
+isa="$2"
+elf="$3"
+pass_pattern="$4"
+fail_pattern="$5"
+
+if [ ! -x "$simulator" ]; then
+    echo "Simulator not found or not executable: $simulator" >&2
+    exit 2
+fi
+
+if [ ! -f "$elf" ]; then
+    echo "ELF not found: $elf" >&2
+    exit 2
+fi
+
+log_file=$(mktemp)
+trap 'rm -f "$log_file"' EXIT
+
+"$simulator" \
+    --isa="$isa" \
+    -f "$elf" \
+    -p tb.top.core.finish_condition=1 \
+    -m 10s \
+    | tee "$log_file"
+
+if grep -Fq "$fail_pattern" "$log_file"; then
+    echo "ThreadX regression reported failure pattern: $fail_pattern" >&2
+    exit 1
+fi
+
+if ! grep -Fq "$pass_pattern" "$log_file"; then
+    echo "Missing expected success pattern in simulator output: $pass_pattern" >&2
+    exit 1
+fi
+
+exit 0