Fix runtime review findings

clients/dotnet/MxGateway.Client/GalaxyRepositoryClient.cs

@@ -18,6 +18,8 @@ namespace MxGateway.Client;
 /// </summary>
 public sealed class GalaxyRepositoryClient : IAsyncDisposable
 {
+    private const int DiscoverHierarchyPageSize = 5000;
+
     private readonly GrpcChannel? _channel;
     private readonly IGalaxyRepositoryClientTransport _transport;
     private readonly ResiliencePipeline _safeUnaryRetryPipeline;
@@ -68,6 +70,8 @@ public sealed class GalaxyRepositoryClient : IAsyncDisposable
             {
                 HttpHandler = handler,
                 LoggerFactory = options.LoggerFactory,
+                MaxReceiveMessageSize = options.MaxGrpcMessageBytes,
+                MaxSendMessageSize = options.MaxGrpcMessageBytes,
             });
 
         return new GalaxyRepositoryClient(
@@ -141,12 +145,25 @@ public sealed class GalaxyRepositoryClient : IAsyncDisposable
     /// </summary>
     public async Task<IReadOnlyList<GalaxyObject>> DiscoverHierarchyAsync(CancellationToken cancellationToken = default)
     {
-        DiscoverHierarchyReply reply = await DiscoverHierarchyRawAsync(
-                new DiscoverHierarchyRequest(),
-                cancellationToken)
-            .ConfigureAwait(false);
+        List<GalaxyObject> objects = [];
+        string pageToken = string.Empty;
+        do
+        {
+            DiscoverHierarchyReply reply = await DiscoverHierarchyRawAsync(
+                    new DiscoverHierarchyRequest
+                    {
+                        PageSize = DiscoverHierarchyPageSize,
+                        PageToken = pageToken,
+                    },
+                    cancellationToken)
+                .ConfigureAwait(false);
 
-        return reply.Objects;
+            objects.AddRange(reply.Objects);
+            pageToken = reply.NextPageToken;
+        }
+        while (!string.IsNullOrWhiteSpace(pageToken));
+
+        return objects;
     }
 
     public Task<DiscoverHierarchyReply> DiscoverHierarchyRawAsync(

clients/dotnet/MxGateway.Client/MxGatewayClient.cs

@@ -64,6 +64,8 @@ public sealed class MxGatewayClient : IAsyncDisposable
             {
                 HttpHandler = handler,
                 LoggerFactory = options.LoggerFactory,
+                MaxReceiveMessageSize = options.MaxGrpcMessageBytes,
+                MaxSendMessageSize = options.MaxGrpcMessageBytes,
             });
 
         return new MxGatewayClient(

clients/dotnet/MxGateway.Client/MxGatewayClientOptions.cs

@@ -23,6 +23,8 @@ public sealed class MxGatewayClientOptions
 
     public TimeSpan? StreamTimeout { get; init; }
 
+    public int MaxGrpcMessageBytes { get; init; } = 16 * 1024 * 1024;
+
     public MxGatewayClientRetryOptions Retry { get; init; } = new();
 
     public ILoggerFactory? LoggerFactory { get; init; }
@@ -66,6 +68,13 @@ public sealed class MxGatewayClientOptions
                 "The stream timeout must be greater than zero when configured.");
         }
 
+        if (MaxGrpcMessageBytes <= 0)
+        {
+            throw new ArgumentOutOfRangeException(
+                nameof(MaxGrpcMessageBytes),
+                "The maximum gRPC message size must be greater than zero.");
+        }
+
         if (UseTls && Endpoint.Scheme != Uri.UriSchemeHttps)
         {
             throw new ArgumentException(