Plugin with git URL silently fails to install on Windows #22280

Description

Looking at the logs, opencode is trying to create a cache directory named after the full plugin spec string, specifically superpowers@git+https:\github.com\obra\superpowers.git - which contains colons. Colons aren't valid in Windows directory names (outside of drive letters), so the mkdir call fails with ENOENT and the plugin just never loads. No visible error in the UI, only in logs.

Plugins

obra/superpowers

OpenCode version

1.4.3

Steps to reproduce

1. On Windows, add a git URL plugin to opencode.json
2. Start OpenCode
3. Plugin doesn't load as intended

Screenshot and/or share link

No response

Operating System

Windows 10 Pro

Terminal

Windows Terminal