## What changed
- Treat enabled plugins from `claude-code-plugins` as coming from
`anthropics/claude-code` when no marketplace source is already known.
- Preserve an explicitly discovered source instead of replacing it with the
inferred source.
## Testing
- Add a migration test covering inference from `enabledPlugins`.
GitOrigin-RevId: f061963356493027968e282a51538866d2bf31f4