fix(gameplay): restore scoreboard phase error contract

realtime/broadcast.py

@@ -0,0 +1,20 @@
+from asgiref.sync import async_to_sync
+from channels.layers import get_channel_layer
+
+
+async def broadcast_phase_event(session_code: str, event_type: str, payload: dict) -> None:
+    """Send a phase event to all WebSocket clients connected to a game session."""
+    channel_layer = get_channel_layer()
+    group_name = f"game_{session_code.upper()}"
+    await channel_layer.group_send(
+        group_name,
+        {
+            "type": "phase_event",
+            "payload": {"type": event_type, **payload},
+        },
+    )
+
+
+def sync_broadcast_phase_event(session_code: str, event_type: str, payload: dict) -> None:
+    """Sync wrapper for calling broadcast_phase_event from synchronous Django views."""
+    async_to_sync(broadcast_phase_event)(session_code, event_type, payload)