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>

voice.py

@@ -214,12 +214,22 @@ class VoiceSession:
             logger.info("Connected (E2EE=HKDF), remote=%d",
                         len(self.lk_room.remote_participants))
 
-            # Find the remote participant to link to
+            # Find the remote participant, wait up to 10s if not yet connected
             remote_identity = None
             for p in self.lk_room.remote_participants.values():
                 remote_identity = p.identity
-                logger.info("Linking to remote participant: %s", remote_identity)
                 break
+            if not remote_identity:
+                logger.info("No remote participant yet, waiting...")
+                for _ in range(100):
+                    await asyncio.sleep(0.1)
+                    for p in self.lk_room.remote_participants.values():
+                        remote_identity = p.identity
+                        break
+                    if remote_identity:
+                        break
+            if remote_identity:
+                logger.info("Linking to remote participant: %s", remote_identity)
 
             # Voice pipeline — German male voice (Daniel)
             self._http_session = aiohttp.ClientSession()
@@ -242,13 +252,13 @@ class VoiceSession:
                 logger.info("AGENT_SPEECH: %s", msg.text_content)
 
             agent = Agent(instructions=VOICE_PROMPT)
-            room_opts = room_io.RoomOptions(
+            io_opts = room_io.RoomOptions(
                 participant_identity=remote_identity,
-            ) if remote_identity else None
+            ) if remote_identity else room_io.RoomOptions()
             await self.session.start(
                 agent=agent,
                 room=self.lk_room,
-                room_options=room_opts,
+                room_options=io_opts,
             )
             logger.info("Voice pipeline started (voice=%s, linked_to=%s)", voice_id, remote_identity)