Smoke test Windows cmd installer wrapper

tests/release_scripts.rs

@@ -100,6 +100,13 @@ fn release_gates_test_all_targets() {
             .contains("[System.Management.Automation.Language.Parser]::ParseFile(\"install.ps1\""),
         "Windows CI must parse the installer with PowerShell"
     );
+    assert!(
+        windows_client.contains("name: cmd installer smoke check")
+            && windows_client.contains("DOSH_INSTALL_PS1=")
+            && windows_client.contains("call install.cmd ok")
+            && windows_client.contains("find /I \";{1}\\dosh-smoke-bin;\""),
+        "Windows CI must execute the cmd wrapper against a local installer stub"
+    );
     assert!(
         windows_client.contains("run: cargo test --all-targets"),
         "Windows CI must run Rust tests, not only build/package"
@@ -259,6 +266,8 @@ fn windows_cmd_installer_wraps_native_powershell_installer() {
     assert!(cmd.contains("for %%P in (powershell.exe pwsh.exe powershell pwsh) do"));
     assert!(cmd.contains("set \"TMP_BINDIR=%TEMP%\\dosh-install-%RANDOM%-%RANDOM%.bindir\""));
     assert!(cmd.contains("set \"DOSH_INSTALL_BINDIR_FILE=%TMP_BINDIR%\""));
+    assert!(cmd.contains("if exist \"%SCRIPT_URL%\" ("));
+    assert!(cmd.contains("copy /Y \"%SCRIPT_URL%\" \"%TMP_PS%\""));
     assert!(cmd.contains("Invoke-WebRequest -UseBasicParsing"));
     assert!(cmd.contains("-ExecutionPolicy Bypass -File \"%TMP_PS%\" %*"));
     assert!(cmd.contains(