Silence Windows git during quiet source updates

tests/release_scripts.rs

@@ -167,15 +167,34 @@ fn windows_installer_reuses_persistent_source_update_cache() {
     assert!(ps1.contains("Assert-NoRelativePathSegments $Path"));
     assert!(ps1.contains("$segment -eq \".\" -or $segment -eq \"..\""));
     assert!(ps1.contains("$sourceCache = Assert-SafeUpdateCache $UpdateCache"));
-    assert!(ps1.contains("git -C $sourceCache fetch --depth 1 origin main"));
+    assert!(ps1.contains(
+        "$fetchArgs = @(\"-C\", $sourceCache, \"fetch\", \"--depth\", \"1\", \"origin\", \"main\")"
+    ));
+    assert!(ps1.contains("$fetchArgs = @(\"-C\", $sourceCache, \"fetch\", \"-q\", \"--depth\", \"1\", \"origin\", \"main\")"));
+    assert!(ps1.contains("git @fetchArgs"));
     assert!(ps1.contains("git -C $sourceCache checkout -q -B main FETCH_HEAD"));
-    assert!(ps1.contains("git clone --depth 1 --branch main $Repo $sourceCache"));
+    assert!(ps1.contains(
+        "$cloneArgs = @(\"clone\", \"--depth\", \"1\", \"--branch\", \"main\", $Repo, $sourceCache)"
+    ));
+    assert!(ps1.contains("$cloneArgs = @(\"clone\", \"-q\", \"--depth\", \"1\", \"--branch\", \"main\", $Repo, $sourceCache)"));
+    assert!(ps1.contains("git @cloneArgs | Out-Null"));
     assert!(
         !ps1.contains("git clone --depth 1 $Repo $tmp"),
         "Windows source updates should reuse a persistent cache instead of recloning into temp"
     );
 }
 
+#[test]
+fn windows_quiet_source_updates_silence_git_like_unix() {
+    let install = include_str!("../install.sh");
+    let ps1 = include_str!("../install.ps1");
+    assert!(install.contains("git -C \"$update_cache\" fetch -q --depth 1 origin main"));
+    assert!(install.contains("git clone -q --depth 1 --branch main \"$repo\" \"$update_cache\""));
+    assert!(ps1.contains("if ($Quiet)"));
+    assert!(ps1.contains("\"fetch\", \"-q\", \"--depth\""));
+    assert!(ps1.contains("\"clone\", \"-q\", \"--depth\""));
+}
+
 #[test]
 fn windows_installer_bootstraps_rust_for_source_fallback_like_unix() {
     let install = include_str!("../install.sh");