feat(ops): upload node logs and task traffic [CI]

backend/shared/MoShiro.Protocol/Raw/RawChunkCodec.cs

@@ -59,8 +59,13 @@ public static class RawChunkCodec
     }
 
     public static byte[] Encode(RawChunk chunk)
+        => Encode(chunk, out _);
+
+    /// <summary>Encode a chunk and return the pre-compression payload size for traffic diagnostics.</summary>
+    public static byte[] Encode(RawChunk chunk, out int uncompressedBytes)
     {
         byte[] plain = EncodeBody(chunk);
+        uncompressedBytes = plain.Length;
         using var compressed = new MemoryStream();
         using (var brotli = new BrotliStream(compressed, CompressionLevel.Optimal, leaveOpen: true))
         {