Function load_enabled_plugins 

pub fn load_enabled_plugins(engine: &mut PluginEngine, enabled: &[String])

Loads all plugins listed in enabled into engine.

Each name is resolved in the following order:

1. The built-in embedded plugin (currently only "bookmarks").
2. A file path in the user’s Trail config directory, with .lua appended.

Failures to load a single plugin are logged at debug level and do not prevent other plugins from loading.