fix: kill concore nodes on Windows without wmic

concore.java

@@ -93,7 +93,7 @@ private static void writeKillScript() {
             script += "    exit /b 0\r\n";
             script += ")\r\n";
             script += "for /f \"usebackq tokens=*\" %%p in (\"%~dp0" + regName + "\") do (\r\n";
-            script += "    wmic process where \"ProcessId=%%p\" get CommandLine /value 2>nul | find /i \"concore\" >nul\r\n";
+            script += "    powershell -NoProfile -Command \"(Get-CimInstance Win32_Process -Filter 'ProcessId=%%p').CommandLine\" 2>nul | findstr /i \"concore\" >nul\r\n";
             script += "    if not errorlevel 1 (\r\n";
             script += "        echo Killing concore process %%p\r\n";
             script += "        taskkill /F /PID %%p >nul 2>&1\r\n";

concore.py

@@ -118,7 +118,7 @@ def _write_kill_script():
         script += "    exit /b 0\r\n"
         script += ")\r\n"
         script += 'for /f "usebackq tokens=*" %%p in ("%~dp0' + reg_name + '") do (\r\n'
-        script += '    wmic process where "ProcessId=%%p" get CommandLine /value 2>nul | find /i "concore" >nul\r\n'
+        script += '    powershell -NoProfile -Command "(Get-CimInstance Win32_Process -Filter \'ProcessId=%%p\').CommandLine" 2>nul | findstr /i "concore" >nul\r\n'
         script += "    if not errorlevel 1 (\r\n"
         script += "        echo Killing concore process %%p\r\n"
         script += "        taskkill /F /PID %%p >nul 2>&1\r\n"

tests/test_concore.py

@@ -716,10 +716,37 @@ def test_write_kill_script_generates_bat_file(self):
         with open(_KILL_SCRIPT_FILE) as f:
             content = f.read()
         assert os.path.basename(_PID_REGISTRY_FILE) in content
-        assert "wmic" in content
+        assert "wmic" not in content
+        assert "Get-CimInstance" in content
         assert "taskkill" in content
         assert "concore" in content.lower()
 
+    @pytest.mark.skipif(sys.platform != "win32", reason="Windows only")
+    def test_kill_script_kills_concore_process(self):
+        import subprocess
+        from concore import _write_kill_script, _KILL_SCRIPT_FILE, _PID_REGISTRY_FILE
+
+        proc = subprocess.Popen(
+            [sys.executable, "-c", "import time; time.sleep(60)", "concore_node"]
+        )
+        try:
+            with open(_PID_REGISTRY_FILE, "w") as f:
+                f.write(str(proc.pid) + "\n")
+            _write_kill_script()
+            result = subprocess.run(
+                ["cmd", "/c", _KILL_SCRIPT_FILE],
+                capture_output=True,
+                text=True,
+                timeout=60,
+            )
+            assert "Killing concore process " + str(proc.pid) in result.stdout
+            proc.wait(timeout=10)
+            assert not os.path.exists(_PID_REGISTRY_FILE)
+            assert not os.path.exists(_KILL_SCRIPT_FILE)
+        finally:
+            if proc.poll() is None:
+                proc.kill()
+
     def test_multi_node_registration(self):
         from concore import _register_pid, _PID_REGISTRY_FILE