v2: terminalize (v2-native tree walker) so terminal() needs no v1

v2/ruby/lib/terminalwire/v2/rails.rb

@@ -65,7 +65,7 @@ def self.dual_terminal(cli, v1: nil, v2: nil)
       # route. (A bare Rack handed to `match to:` drops streaming output in production;
       # the endpoint, like dual_terminal's, is what Rails routing needs.)
       def self.terminal(cli, verbose: nil, report: nil)
-        Terminalwire::V2::Server.dualize(cli)
+        Terminalwire::V2::Server.terminalize(cli)
         v2 = Terminalwire::V2::Server::Rack.new(
           cli,
           verbose: verbose.nil? ? verbose?() : verbose,

v2/ruby/lib/terminalwire/v2/server/dual_thor.rb

@@ -44,5 +44,18 @@ def self.dualize(klass, seen = {})
       klass.subcommand_classes.each_value { |sub| dualize(sub, seen) } if klass.respond_to?(:subcommand_classes)
       klass
     end
+
+    # Walk a Thor class + its subcommand tree, making every command class speak v2
+    # NATIVELY — it includes Terminalwire::V2::Server::Thor (whose `terminalwire`
+    # dispatches with the v2 shell, no v1 `super`). This is the v2-only path: the
+    # app loads only the v2 gem. `dualize` is the transitional both-protocols path.
+    # Idempotent. Returns the class.
+    def self.terminalize(klass, seen = {})
+      return klass if seen[klass]
+      seen[klass] = true
+      klass.include(Terminalwire::V2::Server::Thor) unless klass.include?(Terminalwire::V2::Server::Thor)
+      klass.subcommand_classes.each_value { |sub| terminalize(sub, seen) } if klass.respond_to?(:subcommand_classes)
+      klass
+    end
   end
 end

v2/ruby/spec/server/rails_terminal_spec.rb

@@ -47,9 +47,11 @@ def env(protocols)
       expect(endpoint.instance_variable_get(:@by_subprotocol)["terminalwire.v2"]).to be(rack)
     end
 
-    it "dualizes the cli so it answers the v2 wire" do
+    it "terminalizes the cli so it speaks v2 natively (no v1 needed)" do
       described_class.terminal(cli)
-      expect(cli.include?(Terminalwire::V2::Server::DualThor)).to be(true)
+      expect(cli.include?(Terminalwire::V2::Server::Thor)).to be(true)
+      refute_includes_dual = !cli.include?(Terminalwire::V2::Server::DualThor)
+      expect(refute_includes_dual).to be(true)
     end
   end
 end