fix: return exit code 1 on parse errors

src/winapp-CLI/WinApp.Cli/Program.cs

@@ -282,7 +282,15 @@ internal static async Task<int> Main(string[] args)
                     CancellationToken.None);
             }
 
-            return parsedArgs.InvokeAsync();
+            // Parse errors must exit non-zero (issue #1015). InvokeAsync displays
+            // the error and help text, but return 1 explicitly so scripts and
+            // agents don't treat a rejected command line as success.
+            var invokeExitCode = await parsedArgs.InvokeAsync();
+            if (parsedArgs.Errors.Count > 0 && invokeExitCode == 0)
+            {
+                return 1;
+            }
+            return invokeExitCode;
         });
     }