Speak protocol 3.0 and fall back to 2.0 only when that is the reflector's maximum.

A reflector that has moved to 3.0 will not accept a station that always announces 2.0, and a 2.x reflector still needs one explicit plaintext session.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/opus/opus.go

@@ -5,6 +5,10 @@ package opus
 #cgo pkg-config: opus
 #include <opus.h>
 
+static void reset_decoder(OpusDecoder *dec) {
+	opus_decoder_ctl(dec, OPUS_RESET_STATE);
+}
+
 static int configure_encoder(OpusEncoder *enc) {
 	int err;
 	err = opus_encoder_ctl(enc, OPUS_SET_BITRATE(20000));
@@ -114,6 +118,14 @@ func (d *Decoder) Decode(packet []byte) ([]int16, error) {
 	return pcm, nil
 }
 
+// Reset clears decoder state after a gap in the received audio.
+func (d *Decoder) Reset() {
+	if d == nil || d.dec == nil {
+		return
+	}
+	C.reset_decoder(d.dec)
+}
+
 // Close releases the decoder.
 func (d *Decoder) Close() {
 	if d == nil || d.dec == nil {