launch error display

Services/SshService.cs

@@ -275,10 +275,28 @@ namespace UnifiedFarmLauncher.Services
 
             if (process.ExitCode != 0 && !interactive)
             {
-                throw new InvalidOperationException($"SSH script execution failed with exit code {process.ExitCode}: {error}");
+                var errorText = error.ToString();
+                var combinedOutput = output.ToString();
+                if (!string.IsNullOrWhiteSpace(errorText))
+                {
+                    combinedOutput = string.IsNullOrWhiteSpace(combinedOutput) 
+                        ? errorText 
+                        : $"{combinedOutput}\n\n=== STDERR ===\n{errorText}";
+                }
+                throw new InvalidOperationException($"SSH script execution failed with exit code {process.ExitCode}: {combinedOutput}");
             }
 
-            return output.ToString();
+            // Include stderr in output if present (for diagnostics)
+            var result = output.ToString();
+            var stderrText = error.ToString();
+            if (!string.IsNullOrWhiteSpace(stderrText) && !interactive)
+            {
+                result = string.IsNullOrWhiteSpace(result) 
+                    ? stderrText 
+                    : $"{result}\n\n=== STDERR ===\n{stderrText}";
+            }
+            
+            return result;
         }
 
         public async Task<string> GetWorkerBasePathAsync(WorkerConfig worker)