[Bug] Background process prefix & not working in terminal commands

Bug Description
in /help command

<img width="1364" height="467" alt="Image" src="https://github.com/user-attachments/assets/290620ef-9f9b-4947-8ff9-bb72aa18d2ba" />

there is "& to background" description

but in my case "& npm run dev" command did not working, I think prefix with & is not working now in terminal

<img width="740" height="236" alt="Image" src="https://github.com/user-attachments/assets/be7a0cb1-8ce4-47cd-aada-7cbcfd748818" />

I also tried after installing claude github app, but it still didn't work

Environment Info

• Platform: darwin
• Terminal: tmux
• Version: 2.0.76
• Feedback ID:

Errors

[{"error":"AxiosError: Request failed with status code 403\n    at bx (file:///Users/stefancho/.nvm/versions/node/v22.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:56:1137)\n    at Unzip.<anonymous> (file:///Users/stefancho/.nvm/versions/node/v22.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:57:9852)\n    at Unzip.emit (node:events:530:35)\n    at Unzip.emit (node:domain:489:12)\n    at endReadableNT (node:internal/streams/readable:1698:12)\n    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)\n    at fzA.request (file:///Users/stefancho/.nvm/versions/node/v22.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:59:2130)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async UT2 (file:///Users/stefancho/.nvm/versions/node/v22.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:1845:3609)","timestamp":"2025-12-29T13:49:34.775Z"},{"error":"AxiosError: Request failed with status code 403\n    at bx (file:///Users/stefancho/.nvm/versions/node/v22.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:56:1137)\n    at Unzip.<anonymous> (file:///Users/stefancho/.nvm/versions/node/v22.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:57:9852)\n    at Unzip.emit (node:events:530:35)\n    at Unzip.emit (node:domain:489:12)\n    at endReadableNT (node:internal/streams/readable:1698:12)\n    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)\n    at fzA.request (file:///Users/stefancho/.nvm/versions/node/v22.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:59:2130)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async Z47 (file:///Users/stefancho/.nvm/versions/node/v22.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3506:460)\n    at async Promise.all (index 0)\n    at async file:///Users/stefancho/.nvm/versions/node/v22.14.0/lib/node_modules/@anthropic-ai/claude-code/cli.js:3492:7087","timestamp":"2025-12-29T14:03:04.692Z"}]