refactor: derive canonical commands from core actions and centralize aliases

src/ruby_plugin.rb

@@ -7,7 +7,7 @@ module Vamp
     # @param startup [Object] action catalog and options
     # @return [void]
     def self.startup!(startup)
-      return if hash_shape?(startup, %w[core_actions options]) && startup["options"].is_a?(Hash)
+      return if hash_shape?(startup, %w[command_aliases core_actions options]) && startup["options"].is_a?(Hash)
 
       raise TypeError, "invalid Ruby startup catalog/options"
     end
@@ -100,7 +100,7 @@ module Vamp
   # @return [Proc, Method] the installed sender
   def self.setup(mode, startup, sender)
     FrameValidation.startup!(startup)
-    install_actions(startup["core_actions"])
+    install_actions(startup["core_actions"], startup["command_aliases"])
     @mode = mode
     reset_registrations
     @options = deep_freeze(json_value!(startup["options"]))
@@ -168,6 +168,7 @@ module Vamp
       raise ArgumentError, "declare a plugin before its commands" unless @mode == "plugin" && @name
 
       name = registration_name!(name, "command")
+      raise ArgumentError, "built-in command #{name} cannot be replaced" if Vamp.builtin_command?(name)
       raise ArgumentError, "command requires a block" unless callback
       raise ArgumentError, "duplicate command #{name}" if @commands.key?(name)