fix(board): persist moderator avatar/color in round_summary events

board_orchestrator.py: include moderator_avatar and moderator_color in
the round_summary event payload so downstream consumers have the
moderator's identity metadata.

chat.py: persist expert_avatar and expert_color from the event data into
the board_summary message metadata, ensuring avatar/color survive page
reload instead of falling back to defaults.

src/agentkit/experts/board_orchestrator.py

@@ -167,6 +167,8 @@ class BoardOrchestrator:
                         "round_summary",
                         {
                             "moderator_name": moderator.config.name,
+                            "moderator_avatar": moderator.config.avatar,
+                            "moderator_color": moderator.config.color,
                             "content": summary,
                             "round": round_num,
                             "continue": round_num < self._team.max_rounds,

src/agentkit/server/routes/chat.py

@@ -337,6 +337,8 @@ async def _execute_board_meeting(
                 {
                     "message_type": "board_summary",
                     "expert_name": event_data.get("moderator_name"),
+                    "expert_avatar": event_data.get("moderator_avatar"),
+                    "expert_color": event_data.get("moderator_color"),
                     "board_round": event_data.get("round"),
                     "board_role": "summary",
                 },