Fix response file: Remove quoting as R8/D8 treats each line as complete argument

Co-authored-by: jonathanpeppers <840039+jonathanpeppers@users.noreply.github.com>

Author: Copilot

src/Xamarin.Android.Build.Tasks/Tasks/D8.cs

@@ -163,16 +163,12 @@ protected virtual string CreateResponseFile ()
 		}
 
 		/// <summary>
-		/// Writes a single argument to the response file, quoting if necessary for paths with spaces.
+		/// Writes a single argument to the response file.
+		/// R8/D8 response files treat each line as a complete argument, so no quoting is needed.
 		/// </summary>
 		protected void WriteArg (StreamWriter writer, string arg)
 		{
-			// Quote paths that contain spaces
-			if (arg.Contains (" ")) {
-				writer.WriteLine ($"\"{arg}\"");
-			} else {
-				writer.WriteLine (arg);
-			}
+			writer.WriteLine (arg);
 			Log.LogDebugMessage ($"  {arg}");
 		}
 

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.Android.Build.Tests/Tasks/D8Tests.cs

@@ -96,10 +96,11 @@ public void ResponseFileContainsLibAndInputJars ()
 		}
 
 		/// <summary>
-		/// Tests that paths with spaces are quoted in the response file.
+		/// Tests that paths with spaces are written correctly to the response file.
+		/// R8/D8 response files treat each line as a complete argument, so no quoting is needed.
 		/// </summary>
 		[Test]
-		public void ResponseFileQuotesPathsWithSpaces ()
+		public void ResponseFileHandlesPathsWithSpaces ()
 		{
 			var pathWithSpaces = Path.Combine (tempDir, "path with spaces");
 			Directory.CreateDirectory (pathWithSpaces);
@@ -127,8 +128,8 @@ public void ResponseFileQuotesPathsWithSpaces ()
 				FileAssert.Exists (responseFilePath, "Response file should exist");
 				string responseFileContent = File.ReadAllText (responseFilePath);
 
-				// Paths with spaces should be quoted
-				Assert.IsTrue (responseFileContent.Contains ("\""), "Response file should contain quoted paths");
+				// Paths with spaces should NOT be quoted (R8/D8 treats each line as a complete argument)
+				Assert.IsFalse (responseFileContent.Contains ("\""), "Response file should not contain quoted paths");
 				Assert.IsTrue (responseFileContent.Contains ("path with spaces"), "Response file should contain the path with spaces");
 
 			} finally {