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

Currently, OpenCode only opens cmd.exe on Windows. This is limiting for users who rely on other shells.

Request:
Add support for multiple terminal options on Windows, such as:

• PowerShell
• WSL (default or selectable distro)
• Command Prompt (existing)

Suggested options:

• Config setting to choose preferred terminal
• Auto-detect available terminals
• Optional UI/CLI selector

Benefit:
Improves Windows developer experience and supports modern workflows (WSL, PowerShell).

Thanks!