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## Description <!-- Please remember to add your design buddy onto the PR for review, if it contains any UI changes! --> This PR sets up the initial plumbing for supporting the Codex CLI with multi-harness. It follows the existing pattern for Claude Code and Gemini, implementing the `ThirdPartyHarness` trait for codex. Notable decisions: - We run the CLI with `--dangerously-bypass-approvals-and-sandbox` ([docs](https://developers.openai.com/codex/agent-approvals-security#run-without-approval-prompts)) - We provide the system prompt by writing to `AGENTS.override.md` ([docs](https://developers.openai.com/codex/guides/agents-md))—codex reads this first and recommends it for temporary instructions. It doesn't really matter yet which we use since these are running in a cloud agent context where we control the FS. - Codex, like Gemini, unfortunately doesn't support file input or redirecting stdin. We reuse the `$(cat prompt_file)` approach here for now. ## Testing <!-- How did you test this change? What automated tests did you add? If you didn't add any new tests, what's your justification for not adding any? If you're not sure whether you should add a test, check our testing policy: https://www.notion.so/warpdev/How-We-Code-at-Warp-257fe43d556e4b3c8dfd42f70004cc72#1f97825450504baa9c5fd87a737daa09 --> Tested E2E in downstream PR, https://github.com/warpdotdev/warp/pull/9376 Also confirmed that it picks up the system prompt instructions: <img width="1353" height="912" alt="image" src="https://github.com/user-attachments/assets/6665db5a-fbf3-427f-b95d-2e5c627f3865" /> ## Server API dependencies <!-- You may remove this section if your PR does not have any server dependencies. --> Relies on the support for Codex added to the server in https://github.com/warpdotdev/warp-server/pull/10740 ## Agent Mode - [x] Warp Agent Mode - This PR was created via Warp's AI Agent Mode --------- Co-authored-by: Oz <oz-agent@warp.dev>