Fix missing properties for TextStreamInfo (#881)

Summary of changes:
1. Added new properties to TextStreamInfo: replyToStreamId,
attachedStreamIds, version, generated, operationType
2. Enhanced incoming stream handling: Properly extracts all metadata
from protocol headers
3. Enhanced outgoing stream handling: Correctly populates TextStreamInfo
with all options
4. Added comprehensive test coverage: Tests verify the reply
functionality works correctly
5. No breaking changes: All new properties are optional/defaulted

Fixes: #818

Author: hiroshihorie

lib/src/core/room.dart

@@ -1329,6 +1329,19 @@ extension DataStreamRoomMethods on Room {
         topic: streamHeader.topic,
         timestamp: streamHeader.timestamp.toInt(),
         attributes: streamHeader.attributes,
+        replyToStreamId: streamHeader.textHeader.hasReplyToStreamId()
+            ? streamHeader.textHeader.replyToStreamId
+            : null,
+        attachedStreamIds: streamHeader.textHeader.attachedStreamIds.toList(),
+        version: streamHeader.textHeader.hasVersion()
+            ? streamHeader.textHeader.version
+            : null,
+        generated: streamHeader.textHeader.hasGenerated()
+            ? streamHeader.textHeader.generated
+            : false,
+        operationType: streamHeader.textHeader.hasOperationType()
+            ? streamHeader.textHeader.operationType.name
+            : null,
       );
 
       final streamController = DataStreamController<lk_models.DataStream_Chunk>(

lib/src/participant/local.dart

@@ -1232,20 +1232,26 @@ extension DataStreamParticipantMethods on LocalParticipant {
 
   Future<TextStreamWriter> streamText(StreamTextOptions? options) async {
     final streamId = options?.streamId ?? Uuid().v4();
+    final timestamp = DateTime.timestamp().millisecondsSinceEpoch;
 
     final info = TextStreamInfo(
       id: streamId,
       mimeType: 'text/plain',
-      timestamp: DateTime.timestamp().millisecondsSinceEpoch,
+      timestamp: timestamp,
       topic: options?.topic ?? '',
       size: options?.totalSize ?? 0,
+      replyToStreamId: options?.replyToStreamId,
+      attachedStreamIds: options?.attachedStreamIds ?? [],
+      version: options?.version,
+      generated: options?.generated ?? false,
+      operationType: options?.type,
     );
 
     final header = lk_models.DataStream_Header(
       streamId: streamId,
       mimeType: info.mimeType,
       topic: info.topic,
-      timestamp: Int64(info.timestamp),
+      timestamp: Int64(timestamp),
       totalLength: Int64(options?.totalSize ?? 0),
       attributes: options?.attributes.entries,
       textHeader: lk_models.DataStream_TextHeader(
@@ -1256,11 +1262,13 @@ extension DataStreamParticipantMethods on LocalParticipant {
         operationType: _stringToOperationType(options?.type),
       ),
     );
+
     final destinationIdentities = options?.destinationIdentities;
     final packet = lk_models.DataPacket(
       destinationIdentities: destinationIdentities,
       streamHeader: header,
     );
+
     await room.engine.sendDataPacket(packet, reliability: true);
 
     final writableStream = WritableStream<String>(
@@ -1328,12 +1336,13 @@ extension DataStreamParticipantMethods on LocalParticipant {
 
   Future<ByteStreamWriter> streamBytes(StreamBytesOptions? options) async {
     final streamId = options?.streamId ?? Uuid().v4();
+    final timestamp = DateTime.timestamp().millisecondsSinceEpoch;
 
     final info = ByteStreamInfo(
       name: options?.name ?? 'unknown',
       id: streamId,
       mimeType: options?.mimeType ?? 'application/octet-stream',
-      timestamp: DateTime.timestamp().millisecondsSinceEpoch,
+      timestamp: timestamp,
       topic: options?.topic ?? '',
       size: options?.totalSize ?? 0,
       attributes: options?.attributes ?? {},
@@ -1345,7 +1354,7 @@ extension DataStreamParticipantMethods on LocalParticipant {
       streamId: streamId,
       topic: options?.topic,
       encryptionType: options?.encryptionType,
-      timestamp: Int64(info.timestamp),
+      timestamp: Int64(timestamp),
       byteHeader: lk_models.DataStream_ByteHeader(
         name: info.name,
       ),

lib/src/types/data_stream.dart

@@ -166,13 +166,33 @@ class ByteStreamInfo extends BaseStreamInfo {
 }
 
 class TextStreamInfo extends BaseStreamInfo {
+  /// The stream ID this message is replying to, if any
+  final String? replyToStreamId;
+
+  /// List of stream IDs that are attached to this stream
+  final List<String> attachedStreamIds;
+
+  /// Version of the stream
+  final int? version;
+
+  /// Whether this text was generated by an agent
+  final bool generated;
+
+  /// Operation type for the stream
+  final String? operationType;
+
   TextStreamInfo({
     required String id,
     required String mimeType,
     required String topic,
     required int timestamp,
     required int size,
     Map<String, String> attributes = const {},
+    this.replyToStreamId,
+    this.attachedStreamIds = const [],
+    this.version,
+    this.generated = false,
+    this.operationType,
   }) : super(
           id: id,
           mimeType: mimeType,

test/core/data_stream_test.dart

@@ -219,6 +219,11 @@ void main() {
         final text = await reader.readAll();
         print('received reply message: ${text}');
         expect(text, 'This is a reply to the original message');
+
+        // Verify that reply metadata is accessible
+        expect(reader.info?.replyToStreamId, originalStreamId);
+        expect(reader.info?.version, 1);
+        expect(reader.info?.operationType, 'CREATE');
       });
 
       // Send a reply to an existing stream