Add an option to disable automatic session titles

What variant of Codex are you using?

Codex CLI 0.150.1 on macOS arm64.

What feature would you like to see?

Add a config.toml option that turns off automatic session title generation.

For example:

automatic_session_titles = false

When this is false, Codex should leave the session name alone until the user runs /rename or renames it through another manual action.

I prefer naming sessions myself. Right now, Codex generates a title and changes the session name automatically, with no way to opt out.

Expected behavior

• Codex does not generate or apply session titles automatically.
• Session names remain unchanged until the user renames them.
• Manual renaming still works.

Related issues

• #24289 requests automatic naming after the first prompt.
• #40389 requests configurable title formats.
• #14044 requests dynamic conversation titles.

This request is specifically for a manual-only mode.

Start by tracing how config.toml options are parsed and where automatic session title generation is triggered; the issue does not name specific files or tests. The work is done when setting automatic_session_titles = false prevents automatic title changes while /rename and other manual renaming actions still work.