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/utils/autonomous.py

@@ -10,6 +10,7 @@ from utils.autonomous_engine import autonomous_engine
 from server_manager import server_manager
 import globals
 from utils.logger import get_logger
+from utils.task_tracker import create_tracked_task
 
 logger = get_logger('autonomous')
 
@@ -166,10 +167,10 @@ def on_message_event(message):
     
     # Check if we should act (async, non-blocking)
     if not message.author.bot:  # Only check for human messages
-        asyncio.create_task(_check_and_act(guild_id))
+        create_tracked_task(_check_and_act(guild_id), task_name="autonomous_check_act")
         
         # Also check if we should react to this specific message
-        asyncio.create_task(_check_and_react(guild_id, message))
+        create_tracked_task(_check_and_react(guild_id, message), task_name="autonomous_check_react")
 
 
 async def _check_and_react(guild_id: int, message):