Unity CLI "unity open" exits with code 0 when the Editor process it starts exits with a failure code

Reproduction steps:

1. Open the attached "IN-152822" project
2. Install Unity CLI (more information in the Internal Notes)
3. Open a console in the extracted folder
4. Run "chmod +x stub-editor-fails stub-editor-succeeds"
5. Run "unity open ReproProject --editor-path ./stub-editor-succeeds ; echo exit=$?"
6. Run "unity open ReproProject --editor-path ./stub-editor-fails ; echo exit=$?"
7. Observe the console

Actual result: Both commands print only a Hub project registry warning and both report "exit=0"
Expected result: The second command reports exit code 6 and states that the Editor exited with code 1

Reproducible with: 1.0.0-beta.1, 1.0.0-beta.6

Reproducible environment: Ubuntu 24.04 LTS
Not reproducible environment: No other environments tested

Notes:

• The Unity CLI reference documents exit code 6 as "The command's primary operation failed. For example, an Editor install failed, or the Editor exited with an error", and exit code 0 as "Success": https://docs.unity.com/en-us/unity-cli/unity-cli-reference#exit-codes