fix(go): repair migration wire contracts and runtime lifecycle; document incomplete port

pkg/protocol/frame.go

@@ -24,7 +24,7 @@ func ReadFrame(r io.Reader, cryptor *chacha8.UxChaCha8) (*Frame, error) {
 	}
 
 	payloadLength := int(binary.LittleEndian.Uint32(head[0:4]))
-	if payloadLength < 0 || payloadLength > 16*1024*1024 {
+	if payloadLength < 0 || payloadLength > 8*1024*1024 {
 		return nil, errors.New("invalid frame payload length after decrypt")
 	}
 
@@ -54,8 +54,17 @@ func WriteFrame(w io.Writer, mode byte, payload []byte, cryptor *chacha8.UxChaCh
 		cryptor.XorInPlace(buf)
 	}
 
-	_, err := w.Write(buf)
-	return err
+	for len(buf) > 0 {
+		n, err := w.Write(buf)
+		if err != nil {
+			return err
+		}
+		if n <= 0 || n > len(buf) {
+			return io.ErrShortWrite
+		}
+		buf = buf[n:]
+	}
+	return nil
 }
 
 func ParseRpcPacket(payload []byte) RpcPacket {