android gateway: raise MAX_MESSAGE_LENGTH to 1M so long replies (and complete HTML artifacts) aren't chunked across fence-reopened messages — the stream consumer defaults to 4096 when the adapter sets no cap, and WS has no message-size limit

gateway-plugin/adapter.py

@@ -869,6 +869,13 @@ class AndroidAdapter(BasePlatformAdapter):
     ``MessageEvent``s for ``handle_message()``.
     """
 
+    # WS has no message-size limit. The stream consumer resolves its per-chat
+    # chunking budget via ``max_message_length_for_chat`` -> this attribute
+    # (defaulting to 4096 when unset), which would split long replies — and
+    # complete HTML artifacts — across multiple fence-reopened messages. A
+    # large cap disables that chunking so a reply arrives as a single message.
+    MAX_MESSAGE_LENGTH = 1_000_000
+
     def __init__(self, config, **kwargs):
         platform = Platform("android")
         super().__init__(config=config, platform=platform)