Codex CLI materials.

[rodrigogiraoserrao]

Where to put new files:

• New files should go into a top-level subfolder, named after the article slug. For example: my-awesome-article

How to merge your changes:

1. Make sure the CI code style tests all pass (+ run the automatic code formatter if necessary).
2. Find an RP Team member on Slack and ask them to review & approve your PR.
3. Once the PR has one positive ("approved") review, GitHub lets you merge the PR.
4. 🎉

[acsany]

Hi @rodrigogiraoserrao!
Since I have only a few minor notes, I leave them here:

1. Broken markdown link in top-level README (codex-cli/README.md line 3): There's a stray " breaking the link
2. Project README prompt prefix (codex-cli/rpcontacts/README.md): Shows (venv) $ uv run rpcontacts. Do we need the (venv) prefix here or does uv take care of the venv?
3. requires-python = ">=3.14": The code doesn't use any Python 3.14-specific features. Since uv handles Python installation automatically this isn't a hard blocker, but lowering to >=3.12 or >=3.13 would make the project accessible to more readers without uv