Ability to disable autopilot mode from Shift+Tab cycle

### Describe the feature or problem you'd like to solve

I personally don't like to use auto-pilot, seems risky, so I wan't to remove the feature from shift+tab cycle.

### Proposed solution

I'd like to be able to opt out of autopilot mode appearing in the Shift+Tab mode cycle. Currently the cycle goes interactive → plan → autopilot, and there is no way to remove autopilot from it.

Setting experimental: false in config.json does not help — autopilot remains in the cycle regardless.

A config option like "autopilot_mode": false that would limit Shift+Tab to only cycle between interactive and plan modes would be very appreciated.

### Example prompts or workflows

_No response_

### Additional context

I saw: https://github.com/github/copilot-cli/issues/1671, but thought that this feature is not the same. I want the setting to be on the user config basis.