Function collect_active_plugins 

pub fn collect_active_plugins(
    root: &Path,
    config: &ResolvedConfig,
    discovered: &[DiscoveredFile],
    workspaces: &[WorkspaceInfo],
) -> Result<AggregatedPluginResult, ListInventoryError>

Collect active plugins from the root package and every workspace package.

Missing package manifests are ignored, matching the historical list-command behavior.

Errors

Returns plugin regex validation errors from user-authored plugin settings.