fix: filter own key events, fix RoomOptions None, wait for participant

- Skip bot own encryption_keys events in on_unknown handler
- Always pass valid RoomOptions to AgentSession.start()
- Wait up to 10s for remote participant to connect before starting pipeline

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bot.py

@@ -370,9 +370,12 @@ class Bot:
                 await self._route_verification(room, event)
             return
 
-        # Forward encryption key events to active voice sessions
+        # Forward encryption key events to active voice sessions (skip our own)
         if event.type == ENCRYPTION_KEYS_TYPE:
+            if event.sender == BOT_USER:
+                return  # ignore our own key events
             room_id = room.room_id
+            logger.info("Got encryption_keys timeline event from %s in %s", event.sender, room_id)
             vs = self.voice_sessions.get(room_id)
             if vs:
                 content = event.source.get("content", {})