Enter should insert a newline in Vim Insert mode

What variant of Codex are you using?

CLI

What feature would you like to see?

When Vim mode is enabled in the Codex CLI, I’d like Enter to behave as a normal Enter key while I’m in Vim Insert mode.

Expected behavior

• In Vim Insert mode, pressing Enter should insert a new line.
• Outside of Insert mode, the existing behavior for submitting the prompt can remain unchanged.

Current behavior

Pressing Enter while in Vim Insert mode sends the message to the agent instead of inserting a newline.

Why this would help

This would make Vim mode behave more consistently with normal Vim editing, where Enter in Insert mode creates a new line.

It would also make editing multiline prompts much more natural and reduce accidental submissions while typing.

Additional information

_No response_