Long-press message selection + delete (message.delete frame, outbox removal, all-device sync)

gateway-plugin/protocol.py

@@ -42,6 +42,10 @@ TYPE_MESSAGE_START = "message.start"
 TYPE_MESSAGE_UPDATE = "message.update"
 TYPE_MESSAGE_STOP = "message.stop"
 
+# Message deletion (app requests; broadcast to all devices)
+TYPE_MESSAGE_DELETE = "message.delete"
+TYPE_MESSAGE_DELETED = "message.deleted"
+
 # Tool activity (M2)
 TYPE_TOOL_START = "tool.start"
 TYPE_TOOL_PROGRESS = "tool.progress"
@@ -528,6 +532,33 @@ def history(
     )
 
 
+# ---------------------------------------------------------------------------
+# Message deletion frames
+# ---------------------------------------------------------------------------
+
+def message_deleted(
+    chat_id: str,
+    message_ids: List[str],
+    *,
+    thread_id: Optional[str] = None,
+    id: Optional[int] = None,
+) -> Frame:
+    """Broadcast: the given message(s) were deleted from a chat/thread.
+
+    Carried by the response to a ``message.delete`` request (``id`` set) and
+    broadcast to every device so all of them drop the message(s) from their
+    cache. Also outboxed, so a device that was offline learns of the deletion
+    on its next ``sync``.
+    """
+    return Frame(
+        type=TYPE_MESSAGE_DELETED,
+        id=id,
+        chat_id=chat_id,
+        thread_id=thread_id,
+        payload={"message_ids": list(message_ids)},
+    )
+
+
 # ---------------------------------------------------------------------------
 # Push / notification frames (M5)
 # ---------------------------------------------------------------------------