Issue with Codex in Xcode on intel MacBook Pro

What version of the Codex App are you using (From “About Codex” dialog)?

Codex [codex: 0.129.0-alpha.9] (Installed)

What subscription do you have?

Plus

What platform is your computer?

Darwin 25.5.0 x86_64 i386

What issue are you seeing?

Title:
Xcode downloads arm64 Codex agent on Intel Mac (x86_64), causing sandbox/signature failure

Body:

Environment:

• Intel Mac (x86_64)
• macOS: [your macOS version]
• Xcode: [your Xcode version]
• Codex agent: 0.129.0-alpha.9

Problem:
Xcode downloads the Apple Silicon Codex agent instead of an Intel binary.

Observed agent:
~/Library/Developer/Xcode/CodingAssistant/Agents/codex/0.129.0-alpha.9/codex

Verification:

uname -m
=> x86_64

file codex
=> Mach-O 64-bit executable arm64

Info.plist contains:
https://github.com/openai/codex/releases/download/rust-v0.129.0-alpha.9/codex-aarch64-apple-darwin.tar.gz

Xcode error:
"The code signing identity for the agent did not match expectations, or the agent violated sandboxing rules. Please delete the currently selected agent in the Components section of Settings and download it again."

I fully reset CodingAssistant state and reinstalled multiple times. The issue persists because the wrong architecture binary is being downloaded.

What steps can reproduce the bug?

Install Codex from Intelligence settings and try using it - asking anything fails

What is the expected behavior?

The code signing identity for the agent did not match expectations, or the agent violated sandboxing rules. Please delete the currently selected agent in the Components section of Settings and download it again.

Additional information

_No response_