### Description When i prompt Github Copilot gemini 3.0 to do anything in build mode, it ends up with "invalid request body" error. ### OpenCode version 1.0.76 ### Steps to reproduce 1. Select github copilot gemini 3.0 preview 2. Prompt something like download a youtube video for me 3. receive invalid request body ### Screenshot and/or share link <img width="521" height="279" alt="Image" src="https://github.com/user-attachments/assets/c10b2726-33b8-4e2f-b017-f1fbb0b96238" /> ### Operating System Ubuntu 22.04 ### Terminal Ubuntu bash, terminal