add CUDA test runner script (screen-based, follows harness pattern)

tests/run_cuda_test.sh

@@ -0,0 +1,75 @@
+#!/bin/bash
+# Run the standalone CUDA FMHA test on the B200 using screen sessions.
+# Follows the test harness pattern from README.md.
+# Usage: bash tests/run_cuda_test.sh
+set -e
+
+B200="root@45.76.247.107"
+SSH_OPTS="-o StrictHostKeyChecking=no -o ConnectTimeout=10 -o ServerAliveInterval=15 -o ServerAliveCountMax=4"
+PASS='6)Jr)B@dcX[mN?dx'
+REPO_DIR="/root/dsv4-nvfp4-workspace/kernel"
+VENV="/root/dsv4-nvfp4-workspace/venv/bin/activate"
+
+echo "=== Running CUDA test on B200 via screen harness ==="
+
+sshpass -p "$PASS" ssh $SSH_OPTS $B200 bash -s <<'REMOTE_SCRIPT'
+set -e
+REPO_DIR="/root/dsv4-nvfp4-workspace/kernel"
+
+# --- CLEANUP (same as run_test.sh) ---
+if screen -list 2>/dev/null | grep -q kernel-test; then
+    session_pid=$(screen -ls | grep kernel-test | grep -o '[0-9]*' | head -1)
+    if [ -n "$session_pid" ]; then
+        pkill -9 -P "$session_pid" 2>/dev/null || true
+    fi
+    screen -S kernel-test -X quit 2>/dev/null || true
+fi
+pkill -9 -f test_fmha 2>/dev/null || true
+pkill -9 -f test_tmem 2>/dev/null || true
+sleep 2
+
+# Delete old log
+rm -f /tmp/kernel-test.log
+
+# --- PULL ---
+cd $REPO_DIR
+git checkout -- . 2>/dev/null || true
+git clean -fd 2>/dev/null || true
+git pull
+
+# --- COMPILE + RUN in screen ---
+export PATH=/usr/local/cuda-13.2/bin:$PATH
+
+# Compile
+nvcc -std=c++20 -gencode=arch=compute_100a,code=sm_100a \
+    -I$REPO_DIR \
+    $REPO_DIR/tests/unit/test_fmha_sm100_standalone.cu \
+    -o /tmp/test_fmha_sm100 -lcudart 2>&1 | tee /tmp/kernel-test.log
+
+echo "" >> /tmp/kernel-test.log
+echo "=== Running test ===" >> /tmp/kernel-test.log
+
+# Run in screen (survives SSH drops)
+screen -dmS kernel-test bash -c "timeout 60 /tmp/test_fmha_sm100 >> /tmp/kernel-test.log 2>&1; echo 'EXIT_CODE=$?' >> /tmp/kernel-test.log"
+sleep 3
+
+if screen -list | grep -q kernel-test; then
+    echo "OK: screen kernel-test is running"
+else
+    echo "FAIL: screen did not start. Log below:"
+    cat /tmp/kernel-test.log 2>/dev/null
+    exit 1
+fi
+REMOTE_SCRIPT
+
+echo "=== Test launched. Polling for results... ==="
+while true; do
+    RESULT=$(sshpass -p "$PASS" ssh $SSH_OPTS $B200 "screen -list 2>/dev/null | grep -q kernel-test && echo running || echo done" 2>/dev/null || echo "done")
+    if [ "$RESULT" != "running" ]; then
+        echo "=== Screen finished. Results: ==="
+        sshpass -p "$PASS" ssh $SSH_OPTS $B200 "cat /tmp/kernel-test.log"
+        exit 0
+    fi
+    echo "  ...still running..."
+    sleep 10
+done