pub fn install(boot: &mut impl SubsystemBoot)Expand description
Install the plugin-manager view: register plugins-mode + the :plugins
ex-command. Seated in the host’s Phase-B install list (before the registry
freeze), so it registers directly via boot.modes_mut() / boot.commands_mut().
No dependency on the loader being installed first: the mode resolves
PluginLoaderHandle at activation (by which point boot is complete), and
the ex-command returns a static effect. A missing loader service at activation
degrades to an empty buffer, never a panic.