fix(signal): handle group messages from linked devices in syncMessage path

Closes #23064

When Hermes connects to Signal via signal-cli in daemon mode (linked
device setup), group messages sent from the user's phone were silently
dropped. The syncMessage handler only processed events where
destinationNumber equals the bot's own number (Note to Self).

Group messages from linked devices carry a groupInfo.groupId instead of a
destinationNumber. Extend the condition to also pass through sync messages
that have a groupId, so group messages are promoted to dataMessage and
reach the agent.

gateway/platforms/signal.py

@@ -446,7 +446,9 @@ class SignalAdapter(BasePlatformAdapter):
                 if sent_msg and isinstance(sent_msg, dict):
                     dest = sent_msg.get("destinationNumber") or sent_msg.get("destination")
                     sent_ts = sent_msg.get("timestamp")
-                    if dest == self._account_normalized:
+                    sent_msg_group_info = sent_msg.get("groupInfo") or {}
+                    sent_msg_group_id = sent_msg_group_info.get("groupId") if sent_msg_group_info else None
+                    if dest == self._account_normalized or sent_msg_group_id:
                         # Check if this is an echo of our own outbound reply
                         if sent_ts and sent_ts in self._recent_sent_timestamps:
                             self._recent_sent_timestamps.discard(sent_ts)