The shared singleton command registry — the catalog + plugin static/dynamic registrations, mirroring
DefaultCommandButtonRegistry. CommandRootProvider uses this as its registry, so a plugin's
registerStatic / registerDynamic at app-init reaches resolution and the per-instance mount machinery.
The shared singleton command registry — the catalog + plugin static/dynamic registrations, mirroring DefaultCommandButtonRegistry.
CommandRootProvideruses this as its registry, so a plugin'sregisterStatic/registerDynamicat app-init reaches resolution and the per-instance mount machinery.