chore(extension): exit gracefully when waiting for extension connection (#754)

src/program.ts

@@ -57,7 +57,7 @@ program
     .addOption(new Option('--extension', 'Connect to a running browser instance (Edge/Chrome only). Requires the "Playwright MCP Bridge" browser extension to be installed.').hideHelp())
     .addOption(new Option('--vision', 'Legacy option, use --caps=vision instead').hideHelp())
     .action(async options => {
-      setupExitWatchdog();
+      const abortController = setupExitWatchdog();
 
       if (options.vision) {
         // eslint-disable-next-line no-console
@@ -67,7 +67,7 @@ program
       const config = await resolveCLIConfig(options);
 
       if (options.extension) {
-        await runWithExtension(config);
+        await runWithExtension(config, abortController);
         return;
       }
 
@@ -85,12 +85,15 @@ program
     });
 
 function setupExitWatchdog() {
+  const abortController = new AbortController();
+
   let isExiting = false;
   const handleExit = async () => {
     if (isExiting)
       return;
     isExiting = true;
     setTimeout(() => process.exit(0), 15000);
+    abortController.abort('Process exiting');
     await Context.disposeAll();
     process.exit(0);
   };
@@ -98,6 +101,8 @@ function setupExitWatchdog() {
   process.stdin.on('close', handleExit);
   process.on('SIGINT', handleExit);
   process.on('SIGTERM', handleExit);
+
+  return abortController;
 }
 
 void program.parseAsync(process.argv);