Switch Nym WS transport to nym-client's binary protocol, drop second base64 layer

Client.Send now speaks nym-client's native binary websocket protocol
(tag || recipient || conn_id || data_len || data) instead of wrapping
the ciphertext in a JSON text message, which required base64-encoding
it a second time on top of the browser's own base64 layer.

The reader's self-address query also switched to the binary protocol:
nym-client picks text-vs-binary for every later "received" push based
on the format of the last request seen on a connection, so leaving the
reader in JSON/text mode would have made nym-client run a lossy UTF-8
conversion over the now-unencoded binary payload, corrupting it. Fixed
the binary Received-frame parsing along the way (previous code assumed
a fixed 16-byte tag with no length prefix, which never matched the real
protocol and was never exercised while the connection stayed text-mode).

Verified end-to-end against the real embedded nym-client 1.1.76 binary,
with the exact wire format cross-checked against upstream nym source at
the pinned build commit.

1 files changed, 2 insertions, 3 deletions

diff --git a/cmd/nymdrop-reader/memguard_verify_test.go b/cmd/nymdrop-reader/memguard_verify_test.go
index 3ab5fce..7b240e6 100644
--- a/cmd/nymdrop-reader/memguard_verify_test.go
+++ b/cmd/nymdrop-reader/memguard_verify_test.go
@@ -6,7 +6,6 @@ import (
 	"crypto/ecdh"
 	"crypto/rand"
 	"crypto/sha256"
-	"encoding/base64"
 	"encoding/hex"
 	"io"
 	"testing"
@@ -53,9 +52,9 @@ func TestDecryptMessageAfterMemguard(t *testing.T) {
 
 	packet := append(append(append([]byte{}, ephPriv.PublicKey().Bytes()...), iv...), ciphertext...)
 	noncePrefix := hex.EncodeToString(make([]byte, 16)) + ":"
-	dataB64 := base64.StdEncoding.EncodeToString(append([]byte(noncePrefix), packet...))
+	raw := append([]byte(noncePrefix), packet...)
 
-	got, err := decryptMessage(dataB64, readerPriv)
+	got, err := decryptMessage(raw, readerPriv)
 	if err != nil {
 		t.Fatalf("decryptMessage: %v", err)
 	}