[FEATURE]:Grok 4.3 reasoning levels

[nathanielstam05-ctrl]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Grok 4.3 in OpenCode currently has no reasoning levels.
Grok 4.3 on API has none/low/medium/high, hopefully this would work with OAuth as well
Thanks!

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Enable Grok 4.2 Thinking mode #17030: [FEATURE]: Enable Grok 4.2 Thinking mode — requests enabling thinking/reasoning mode for Grok models, which covers similar ground.

If your request is specifically about exposing the none/low/medium/high reasoning effort levels as distinct options (rather than just enabling thinking mode), please clarify that distinction in the issue so it can be evaluated separately.