fix(cli): force exit after render completes to prevent process hang

Node.js keeps the process alive due to lingering HTTP connections from
fetch() keep-alive pool (update checks and telemetry). The exit event
handler in cli.ts fires flushSync() which spawns a detached child
process so telemetry data is not lost.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

packages/cli/src/commands/render.ts

@@ -209,6 +209,12 @@ Examples:
         browserPath,
       });
     }
+
+    // Force exit — Node keeps the process alive due to lingering HTTP
+    // connections (fetch keep-alive pool from update checks / telemetry).
+    // The 'exit' event handler in cli.ts fires flushSync() which spawns a
+    // detached child process so telemetry data is not lost.
+    process.exit(0);
   },
 });