## Why
The Desktop app can use Codex or ChatGPT branding while retaining stable platform identities. CLI discovery and TUI handoff should not depend on a single display name or hardcoded executable path.
## What changed
- On macOS, search for both `ChatGPT.app` and `Codex.app`, and accept only bundles with the `com.openai.codex` identifier.
- On Windows, detect installs by their package app ID and resolve the `codex` protocol executable from the AppX manifest before handing off a TUI session.
- Use “Desktop app” consistently in CLI and TUI user-facing text.
## Testing
Add coverage for selecting a ChatGPT-named Codex bundle and rejecting the classic ChatGPT bundle.
GitOrigin-RevId: b84a56eb6e960712152e1a9b023ab530ec9a354a
## Summary
`codex app` should be a platform-aware entry point for opening Codex
Desktop or helping users install it. Before this change, the command
only existed on macOS and its default installer URL always pointed at
the Apple Silicon DMG, which sent Intel Mac users to the wrong build.
This updates the macOS path to choose the Apple Silicon or Intel DMG
based on the detected processor, while keeping `--download-url` as an
advanced override. It also enables `codex app` on Windows, where the CLI
opens an installed Codex Desktop app when available and otherwise opens
the Windows installer URL.
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Co-authored-by: Felipe Coury <felipe.coury@openai.com>
Eric Traut