feat: disable interactive shell in Forever Mode

Interactive shell (PTY) is unnecessary in long-running Forever Mode
sessions and can cause hangs. Force-disable it when isForeverMode
is true.

packages/core/src/config/config.ts

@@ -2621,6 +2621,7 @@ export class Config implements McpContext {
   }
 
   isInteractiveShellEnabled(): boolean {
+    if (this.isForeverMode) return false;
     return (
       this.interactive &&
       this.ptyInfo !== 'child_process' &&