Remove ArtRDM TOD discovery support

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

receiver.go

@@ -13,10 +13,6 @@ type Handler interface {
 	HandlePollReply(src *net.UDPAddr, pkt *PollReplyPacket)
 }
 
-type TodDataHandler interface {
-	HandleTodData(src *net.UDPAddr, pkt *TodDataPacket)
-}
-
 type Receiver struct {
 	conn    *net.UDPConn
 	handler Handler
@@ -132,11 +128,5 @@ func (r *Receiver) handle(src *net.UDPAddr, data []byte) {
 		if reply, ok := pkt.(*PollReplyPacket); ok {
 			r.handler.HandlePollReply(src, reply)
 		}
-	case OpTodData:
-		if todHandler, ok := r.handler.(TodDataHandler); ok {
-			if tod, ok := pkt.(*TodDataPacket); ok {
-				todHandler.HandleTodData(src, tod)
-			}
-		}
 	}
 }