Emit completion signal on command failure

src/eepm/executor.rs

@@ -243,6 +243,14 @@ impl EpmExecutor {
                     "Operation completed",
                     &tx_str,
                 ).await;
+            } else {
+                let error_msg = stderr_lines.last().cloned()
+                    .unwrap_or_else(|| format!("Failed with exit code {}", status.code().unwrap_or(-1)));
+                let _ = emitter.emit_progress_done(
+                    "system.error",
+                    &error_msg,
+                    &tx_str,
+                ).await;
             }
         }