fix(tasks): replace fire-and-forget asyncio.create_task with create_tracked_task

Add utils/task_tracker.py with create_tracked_task() that wraps background
tasks with error logging, cancellation handling, and reference tracking.

Replace all 17 fire-and-forget asyncio.create_task() calls across 7 files:
- bot/bot.py (5 interjection checks)
- bot/utils/autonomous.py (2 check-and-act/react tasks)
- bot/utils/bipolar_mode.py (3 argument tasks)
- bot/commands/uno.py (1 game loop task)
- bot/utils/voice_receiver.py (3 STT/interruption callbacks)
- bot/utils/persona_dialogue.py (4 dialogue turn/interjection tasks)

Previously-tracked tasks (voice_audio.py, voice_manager.py) were left as-is
since they already store task references for cancellation.

Closes #1

bot/commands/uno.py

@@ -9,6 +9,7 @@ import json
 import logging
 from typing import Optional, Dict, Any
 from utils.logger import get_logger
+from utils.task_tracker import create_tracked_task
 
 logger = get_logger('uno')
 
@@ -64,7 +65,7 @@ async def join_uno_game(message: discord.Message, room_code: str):
             await message.channel.send(f"✅ Joined room **{room_code}**! Waiting for Player 1 to start the game... 🎮")
             
             # Start the game loop
-            asyncio.create_task(player.play_game())
+            create_tracked_task(player.play_game(), task_name=f"uno_game_{room_code}")
         else:
             await message.channel.send(f"❌ Couldn't join room **{room_code}**. Make sure the room exists and has space!")