gameserver: dump raw packet bit-stream for hand-decode

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Prospect.Unreal/Net/UNetConnection.cs

@@ -501,6 +501,21 @@ public abstract class UNetConnection : UPlayer
         var resetReaderMark = new FBitReaderMark(reader);
         var channelsToClose = new List<FChannelCloseInfo>();
 
+        // TEMP DIAG: dump the raw packet bit-stream (LSB-first per byte) so we can
+        // hand-decode the header/bunch alignment. Non-destructive (position restored).
+        {
+            var peekMark = new FBitReaderMark(reader);
+            var totalDiag = reader.GetBitsLeft();
+            var takeDiag = Math.Min(totalDiag, 112);
+            var sbDiag = new System.Text.StringBuilder(takeDiag);
+            for (var i = 0; i < takeDiag; i++)
+            {
+                sbDiag.Append(reader.ReadBit() ? '1' : '0');
+            }
+            peekMark.Pop(reader);
+            Logger.Information("[HS-RAW] totalBits={T} bits={B}", totalDiag, sbDiag.ToString());
+        }
+
         if (_bInternalAck)
         {
             ++InPacketId;