Speed up Windows source fallback installs

tests/release_scripts.rs

@@ -209,6 +209,27 @@ fn windows_installer_honors_quiet_update_mode() {
     );
 }
 
+#[test]
+fn windows_source_fallback_builds_client_only_like_unix() {
+    let install = include_str!("../install.sh");
+    let ps1 = include_str!("../install.ps1");
+    assert!(install.contains("cargo build -q --release --bin dosh-client"));
+    assert!(install.contains("cargo build --release --bin dosh-client"));
+    assert!(ps1.contains("$buildArgs = @(\"build\", \"--release\", \"--bin\", \"dosh-client\")"));
+    assert!(
+        ps1.contains(
+            "$buildArgs = @(\"build\", \"-q\", \"--release\", \"--bin\", \"dosh-client\")"
+        ),
+        "Windows quiet source fallback should use cargo -q like Unix"
+    );
+    assert!(ps1.contains("cargo @buildArgs"));
+    assert!(
+        !ps1.contains("cargo build --release --bin dosh-client --bin dosh-bench"),
+        "Windows client source fallback must not compile dosh-bench on every update"
+    );
+    assert!(ps1.contains("if (Test-Path \"target\\release\\dosh-bench.exe\")"));
+}
+
 #[test]
 fn windows_installer_adds_user_path_idempotently() {
     let ps1 = include_str!("../install.ps1");