chore: Remove debug logging and pipecat-poc after E2EE fix confirmed working

- Remove setLevel(DEBUG) for livekit.agents/plugins (added for diagnostics)
- Remove periodic E2EE cryptor/participant state poll loop (no longer needed)
- Remove pipecat-poc/pipeline.py (POC never deployed, LiveKit approach confirmed)

E2EE bidirectional voice confirmed working in MAT-36.

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

voice.py

@@ -15,9 +15,6 @@ from livekit.plugins import openai as lk_openai, elevenlabs, silero
 
 logger = logging.getLogger("matrix-ai-voice")
 
-# Enable debug logging for agents pipeline to diagnose audio issues
-logging.getLogger("livekit.agents").setLevel(logging.DEBUG)
-logging.getLogger("livekit.plugins").setLevel(logging.DEBUG)
 
 LITELLM_URL = os.environ.get("LITELLM_BASE_URL", "")
 LITELLM_KEY = os.environ.get("LITELLM_API_KEY", "not-needed")
@@ -371,23 +368,8 @@ class VoiceSession:
             except asyncio.TimeoutError:
                 logger.error("Greeting timed out")
 
-            # Periodic E2EE state poll to diagnose incoming decryption
-            _poll_count = 0
             while True:
                 await asyncio.sleep(5)
-                _poll_count += 1
-                if _poll_count % 2 == 0:  # Every 10s
-                    try:
-                        cryptors = self.lk_room.e2ee_manager.frame_cryptors()
-                        for c in cryptors:
-                            logger.info("E2EE_CRYPTOR: identity=%s key_index=%d enabled=%s",
-                                        c.participant_identity, c.key_index, c.enabled)
-                    except Exception as e:
-                        logger.debug("frame_cryptors() failed: %s", e)
-                    # Log E2EE state for all remote participants
-                    for p in self.lk_room.remote_participants.values():
-                        logger.info("REMOTE_PARTICIPANT: identity=%s tracks=%d",
-                                    p.identity, len(p.track_publications))
 
         except asyncio.CancelledError:
             logger.info("Session cancelled for %s", self.room_id)