Make Windows prebuilt bench optional

tests/release_scripts.rs

@@ -230,6 +230,21 @@ fn windows_source_fallback_builds_client_only_like_unix() {
     assert!(ps1.contains("if (Test-Path \"target\\release\\dosh-bench.exe\")"));
 }
 
+#[test]
+fn windows_prebuilt_install_requires_client_but_not_bench() {
+    let install = include_str!("../install.sh");
+    let ps1 = include_str!("../install.ps1");
+    assert!(install.contains("install_extracted_binary \"$tmpdir/extract\" dosh-client"));
+    assert!(install.contains("if found_bench=\"$(find_extracted_binary"));
+    assert!(ps1.contains("throw \"prebuilt archive missing dosh-client.exe\""));
+    assert!(ps1.contains("-Filter \"dosh-bench.exe\""));
+    assert!(ps1.contains("if ($bench)"));
+    assert!(
+        !ps1.contains("throw \"prebuilt archive missing dosh-bench.exe\""),
+        "Windows prebuilt install should not fall back to source just because dosh-bench is absent"
+    );
+}
+
 #[test]
 fn windows_installer_adds_user_path_idempotently() {
     let ps1 = include_str!("../install.ps1");