fix: use standard ctx.connect() for audio pipeline (CF-1170)

Custom rtc.Room skipped ctx.connect(), leaving framework audio
input pipeline uninitialized. STT/VAD never received audio frames.
Switch to standard approach: ctx.connect() + ctx.room.
Added debug event logging for speech pipeline.

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

agent.py

@@ -1,21 +1,14 @@
 import os
-import asyncio
 import logging
 
-from livekit import rtc
-from livekit.api import AccessToken, VideoGrants
-from livekit.agents import Agent, AgentSession, AgentServer, JobContext, JobProcess, cli, room_io
+from livekit.agents import Agent, AgentSession, AgentServer, JobContext, JobProcess, cli
 from livekit.plugins import openai as lk_openai, elevenlabs, silero
 
 logger = logging.getLogger("matrix-ai-agent")
-logging.basicConfig(level=logging.INFO)
+logging.basicConfig(level=logging.DEBUG)
 
 LITELLM_URL = os.environ["LITELLM_BASE_URL"]
 LITELLM_KEY = os.environ.get("LITELLM_API_KEY", "not-needed")
-LK_API_KEY = os.environ["LIVEKIT_API_KEY"]
-LK_API_SECRET = os.environ["LIVEKIT_API_SECRET"]
-LK_URL = os.environ["LIVEKIT_URL"]
-BOT_IDENTITY = os.environ.get("BOT_IDENTITY", "@ai:agiliton.eu:AIBOT")
 
 SYSTEM_PROMPT = """You are a helpful voice assistant in a Matrix call.
 Rules:
@@ -36,46 +29,12 @@ server.setup_fnc = prewarm
 
 @server.rtc_session()
 async def entrypoint(ctx: JobContext):
-    room_name = ctx.job.room.name
-    logger.info("Job received for room %s, connecting with Matrix identity...", room_name)
+    logger.info("Job received for room %s", ctx.job.room.name)
 
-    # Generate a token with the correct Matrix user identity
-    token = (
-        AccessToken(LK_API_KEY, LK_API_SECRET)
-        .with_identity(BOT_IDENTITY)
-        .with_grants(VideoGrants(
-            room=room_name,
-            room_join=True,
-            can_publish=True,
-            can_subscribe=True,
-        ))
-        .to_jwt()
-    )
-
-    # Connect our own room with the Matrix identity (NOT ctx.connect())
-    custom_room = rtc.Room()
-    await custom_room.connect(LK_URL, token)
-    logger.info("Connected to room as %s", BOT_IDENTITY)
-
-    # Wait for a real (non-agent) participant
-    def has_real_participant():
-        return any(
-            not p.identity.startswith("agent-")
-            for p in custom_room.remote_participants.values()
-        )
-
-    if not has_real_participant():
-        logger.info("Waiting for real participant...")
-        fut = asyncio.get_event_loop().create_future()
-
-        def on_participant(p: rtc.RemoteParticipant):
-            if not p.identity.startswith("agent-") and not fut.done():
-                fut.set_result(p)
-
-        custom_room.on("participant_connected", on_participant)
-        await fut
-
-    logger.info("Participants: %s", list(custom_room.remote_participants.keys()))
+    # Standard framework connection (handles audio pipeline properly)
+    await ctx.connect()
+    logger.info("Connected to room, local identity: %s", ctx.room.local_participant.identity)
+    logger.info("Remote participants: %s", list(ctx.room.remote_participants.keys()))
 
     model = os.environ.get("LITELLM_MODEL", "claude-sonnet")
     voice_id = os.environ.get("ELEVENLABS_VOICE_ID", "21m00Tcm4TlvDq8ikWAM")
@@ -94,46 +53,24 @@ async def entrypoint(ctx: JobContext):
         vad=ctx.proc.userdata["vad"],
     )
 
-    # Find the real user's identity for targeted audio input
-    real_identity = next(
-        (p.identity for p in custom_room.remote_participants.values()
-         if not p.identity.startswith("agent-")),
-        None,
-    )
-    logger.info("Starting agent session, targeting participant: %s", real_identity)
+    # Debug: log pipeline events
+    @session.on("user_speech_committed")
+    def on_speech(msg):
+        logger.info("USER_SPEECH_COMMITTED: %s", msg.text_content)
+
+    @session.on("agent_speech_committed")
+    def on_agent_speech(msg):
+        logger.info("AGENT_SPEECH_COMMITTED: %s", msg.text_content)
 
     agent = Agent(instructions=SYSTEM_PROMPT)
-    input_opts = room_io.RoomInputOptions(
-        participant_identity=real_identity,
-    )
     await session.start(
         agent=agent,
-        room=custom_room,
-        room_input_options=input_opts,
+        room=ctx.room,
     )
     logger.info("Session started, generating greeting...")
     await session.generate_reply(instructions="Greet the user briefly.")
     logger.info("Greeting generated.")
 
-    # Wait for all real participants to leave, then disconnect cleanly
-    # so the LiveKit room gets deleted and auto-dispatch fires on next call
-    left_fut = asyncio.get_event_loop().create_future()
-
-    def on_participant_left(p: rtc.RemoteParticipant):
-        # Check if any real (non-agent) participants remain
-        remaining = [
-            pid for pid in custom_room.remote_participants
-            if not pid.startswith("agent-")
-        ]
-        if not remaining and not left_fut.done():
-            left_fut.set_result(True)
-
-    custom_room.on("participant_disconnected", on_participant_left)
-    await left_fut
-    logger.info("All participants left, disconnecting custom room...")
-    await custom_room.disconnect()
-    logger.info("Room disconnected, agent exiting.")
-
 
 if __name__ == "__main__":
     cli.run_app(server)