fix(desktop): shut down cleanly with workspace terminals (#3268)

Workspace terminal shutdown only signaled an npm wrapper, leaving Electron alive with broken output pipes. Make the signal-handling runner the terminal-owned process and route external Electron termination through the existing quit lifecycle.

packages/desktop/src/main.ts

@@ -83,6 +83,7 @@ import {
 } from "./daemon/daemon-manager.js";
 import {
   createQuitLifecycle,
+  registerExternalQuitSignals,
   stopDesktopManagedDaemonOnQuitIfNeeded,
 } from "./daemon/quit-lifecycle.js";
 import { runDesktopStartup } from "./desktop-startup.js";
@@ -1081,6 +1082,7 @@ const quitLifecycle = createQuitLifecycle({
 // electron-updater forwards this event through Electron's built-in autoUpdater.
 electronAutoUpdater.on("before-quit-for-update", quitLifecycle.handleBeforeQuitForUpdate);
 app.on("before-quit", quitLifecycle.handleBeforeQuit);
+registerExternalQuitSignals({ signals: process, quit: () => app.quit() });
 
 app.on("window-all-closed", () => {
   if (process.platform !== "darwin") {