[Bug] Installed plugins on project scopes not available to install in another project

Bug Description
The plugin installed in project scope (project A), and it didn't show in the plugin list for me to install in another project (project B)

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.1.12
• Feedback ID: 408e6080-ce1d-47f6-8a60-934b1dc5c686

Errors

[{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at WIT (/$bunfs/root/claude:4566:22181)\n    at async <anonymous> (/$bunfs/root/claude:5462:717)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-19T02:43:30.747Z"}]

Project A installed list has frontend-design plugin:

<img width="574" height="279" alt="Image" src="https://github.com/user-attachments/assets/c75eeba5-77bc-4faa-a9b5-2fd1b38cff17" />

Project B installed list (hasn't installed frontend-design plugin):

<img width="1410" height="568" alt="Image" src="https://github.com/user-attachments/assets/12f95c0b-7b96-4fdc-92fa-621da6cd6644" />

Project B discover list (didn't have frontend-design plugin to install):

<img width="1398" height="416" alt="Image" src="https://github.com/user-attachments/assets/4ff8f0c9-d95d-44d7-87a6-47da9928d1ed" />