[Feature Request] Support hierarchical branch names with slashes in repository configuration

Bug Description
With the Claude Code plugin installation, starting from v2.0.28 it became possible to specify a repository branch. However, when the branch name has a hierarchical structure like feature/create-skills, an error occurs and the plugin fails to load correctly. We would like this to be improved so that such branches can be loaded properly.

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.1.2
• Feedback ID: 01d4110a-ee60-4850-b2c3-bb8313b9e547