[codex] Address testbed procedure review

[Joncallim]

Summary

• Replace the local checkout path in the Docker testbed procedure with a generic repository-root instruction.
• Use the fixture-recorded Docker command for manual checks so hosts that need sudo -n docker are supported.

Reviewer Feedback Addressed

• Codex Reviewer: replace the hard-coded checkout path.
• Codex Reviewer: honor the sudo Docker mode in manual checks.

Validation

• git diff --check

[Joncallim]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 586829dfd7

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[Joncallim]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 4f42096163

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".