Function fetch_plugin_details 

pub async fn fetch_plugin_details(
    cwd_raw: String,
    cached_claude_path: Option<PathBuf>,
    requests: Vec<(String, String)>,
) -> BTreeMap<String, (String, PluginDetails)>

Fetch the always-on cost for (plugin id, version) requests, sequentially, one claude plugin details call each. A plugin whose details fail is simply absent from the map - a missing cost reads as no badge, never as an error on the pane.