fix(processes): fix multiple clawx processes running concurently (#589)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Haze <hazeone@users.noreply.github.com>
Co-authored-by: paisley <8197966+su8su@users.noreply.github.com>
Co-authored-by: Felix <24791380+vcfgv@users.noreply.github.com>

electron/main/signal-quit.ts

@@ -0,0 +1,11 @@
+export interface SignalQuitHandlerHooks {
+  logInfo: (message: string) => void;
+  requestQuit: () => void;
+}
+
+export function createSignalQuitHandler(hooks: SignalQuitHandlerHooks): (signal: NodeJS.Signals) => void {
+  return (signal: NodeJS.Signals) => {
+    hooks.logInfo(`Received ${signal}; requesting app quit`);
+    hooks.requestQuit();
+  };
+}