refactor: enhance command processing for dual-mode channel compatibility

turtle.lua

@@ -446,9 +446,11 @@ parallel.waitForAny(
 
     function()
         -- Command processing (eval protocol)
+        -- Uses Channels.match() for dual-mode safety: accepts messages on
+        -- both legacy (100) and target (4210) channels during migration.
         while true do
             local event, side, channel, replyChannel, message = os.pullEvent("modem_message")
-            if channel == CHANNEL_RECEIVE then
+            if Channels.match('remoteturtle.command', channel) then
                 processMessage(channel, message)
             end
         end