[Codex App] Continue an existing ChatGPT conversation in Codex

Feature request

Add a first-party Continue in Codex action for an existing ChatGPT conversation.

Desired flow:

ChatGPT conversation → Continue in Codex → choose repository/workspace → resumable Codex thread

Why

Long technical conversations in ChatGPT can contain important context: decisions, logs, screenshots, failed approaches, constraints, and the exact point where work stopped. Today, moving to Codex requires starting a new thread and manually copying or summarizing that context, which wastes time/tokens and can lose useful information.

Possible implementation path

Codex already has an external-agent session import mechanism, used for workflows such as Claude Code → Codex. That seems like a useful precedent for an explicit, user-authorized ChatGPT → Codex import, although ChatGPT-specific privacy or data-model constraints may differ.

The imported conversation does not need to share the same history database; creating a new persistent Codex thread from the relevant ChatGPT context would be enough.

If there is a ChatGPT-specific architectural, privacy, or data-model limitation preventing this, it would be useful to understand what the blocker is.

Start by reviewing Codex's existing external-agent session import mechanism, which the issue identifies as the relevant precedent. Determine how a user-authorized ChatGPT conversation could produce a persistent Codex thread after repository or workspace selection, and document the privacy or data-model constraints; done means the proposed flow is viable or its blocker is clearly established.