Add ability to rename Codex chat/session titles (CLI + VS Code)

What variant of Codex are you using?

IDE Extension

What feature would you like to see?

Summary
Please add a built-in way to rename Codex conversation titles after a chat is created.

Current behavior
Session/thread names are auto-generated, and there is no supported rename action in the UI/CLI picker.

Expected behavior
I should be able to rename an existing chat/session title from:

VS Code Codex chat list
CLI session picker (codex resume / session history)
Suggested UX
Context menu action: Rename
Keyboard shortcut support where applicable (for example F2 in list views)
Rename should update all places where the title appears (history list, picker, etc.)
Graceful handling for duplicate names (allowed or auto-disambiguated)
Why this matters
I keep long-running threads and need meaningful names for later retrieval. Auto-generated titles are often not specific enough once scope changes.

Workaround today
Manual edits to local session metadata are possible but unsupported and risky; a first-class rename action would be much safer.

Environment
Codex CLI version: 0.115.0-alpha.27
Platform: macOS
Editor: VS Code integration

Additional information

_No response_