feat(batch2): verify parser remainder features

dotnet/src/ZB.MOM.NatsNet.Server/ClientConnection.cs

@@ -1158,6 +1158,58 @@ public sealed partial class ClientConnection
             TraceInOp("PRE", pre);
     }
 
+    // =========================================================================
+    // Parser compatibility wrappers (features 2588, 2590, 2591)
+    // =========================================================================
+
+    /// <summary>
+    /// Parses protocol bytes using the shared parser state for this connection.
+    /// Mirrors Go <c>client.parse</c>.
+    /// </summary>
+    internal Exception? Parse(byte[] buf, IProtocolHandler handler)
+    {
+        ArgumentNullException.ThrowIfNull(buf);
+        ArgumentNullException.ThrowIfNull(handler);
+
+        ParseCtx.Kind = Kind;
+        ParseCtx.HasHeaders = Headers;
+        if (_mcl > 0)
+            ParseCtx.MaxControlLine = _mcl;
+        if (_mpay != 0)
+            ParseCtx.MaxPayload = _mpay;
+
+        return ProtocolParser.Parse(ParseCtx, handler, buf);
+    }
+
+    /// <summary>
+    /// Checks max control line enforcement for the current connection kind.
+    /// Mirrors Go <c>client.overMaxControlLineLimit</c>.
+    /// </summary>
+    internal Exception? OverMaxControlLineLimit(byte[] arg, int mcl, IProtocolHandler handler)
+    {
+        ArgumentNullException.ThrowIfNull(arg);
+        ArgumentNullException.ThrowIfNull(handler);
+
+        ParseCtx.Kind = Kind;
+        return ProtocolParser.OverMaxControlLineLimit(ParseCtx, handler, arg, mcl);
+    }
+
+    /// <summary>
+    /// Re-processes stored pub args for split-buffer message payload handling.
+    /// Mirrors Go <c>client.clonePubArg</c>.
+    /// </summary>
+    internal Exception? ClonePubArg(IProtocolHandler handler, bool lmsg)
+    {
+        ArgumentNullException.ThrowIfNull(handler);
+
+        ParseCtx.Kind = Kind;
+        ParseCtx.HasHeaders = Headers;
+        if (_mpay != 0)
+            ParseCtx.MaxPayload = _mpay;
+
+        return ProtocolParser.ClonePubArg(ParseCtx, handler, lmsg);
+    }
+
     /// <summary>
     /// Generates the INFO JSON bytes sent to the client on connect.
     /// Stub — full implementation in session 09.