cant use config file to set free model as default

[richard-hunter-hpe]

Describe the bug

if model isn't a premium one, cant set it in config.yaml

steps to reproduce:

1. put model prop in config.yaml
2. for value, put in a free model slug, i.e. gpt-5-mini
3. start copilot cli
4. notice model has changed to something else
5. cat the config.yaml
6. notice your entry is deleted

It's a bit weird also that copilot is changing config.yaml, isn't this supposed to be a user controlled configuration file?

https://docs.github.com/en/copilot/reference/copilot-cli-reference/cli-config-dir-reference#user-editable-files

Affected version

No response

Steps to reproduce the behavior

No response

Expected behavior

No response

Additional context

No response

[tpope]

Fixed in the 1.0.35.

P.S. Settings have been migrated from config.json to settings.json. config.json turned into a dumping ground for application state so I've ceded the territory and given settings a home of their own.