Allow remote connection providers to create/select hosts in Add remote project

What variant of Codex are you using?

App

What feature would you like to see?

Codex remote SSH works once a host exists in ~/.ssh/config, but tools like Coder, Codespaces, Dev Containers, and internal devbox systems have use cases where you want to create hosts on demand (ephemeral environments)

Would be great if there was an extension point for the Add remote project dialog so a plugin/provider can:

• list available remote workspaces
• create a new remote workspace
• update/return a concrete SSH host alias
• return a suggested project path
• refresh/select that host in the existing remote-project flow

A simpler alternative could also deep link such as: codex://remote-project?host=<ssh-alias>&path=<remote-path>

Or even entry points engineers can write themselves so it's platform agnostic.

Additional information

_No response_