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/task_tracker.py

@@ -0,0 +1,54 @@
+# utils/task_tracker.py
+"""
+Tracked asyncio task creation utility.
+
+Replaces fire-and-forget asyncio.create_task() calls with error-logging wrappers
+so that exceptions in background tasks are never silently swallowed.
+"""
+
+import asyncio
+from typing import Optional, Coroutine, Set
+from utils.logger import get_logger
+
+logger = get_logger("task_tracker")
+
+# Keep references to running tasks so they aren't garbage-collected
+_active_tasks: Set[asyncio.Task] = set()
+
+
+def create_tracked_task(
+    coro: Coroutine,
+    task_name: Optional[str] = None,
+) -> asyncio.Task:
+    """
+    Create an asyncio task with automatic error logging.
+
+    Unlike bare asyncio.create_task(), this wrapper:
+    - Names the task for easier debugging
+    - Logs any unhandled exception (with full traceback) instead of swallowing it
+    - Keeps a strong reference so the task isn't garbage-collected mid-flight
+    - Auto-cleans the reference set when the task finishes
+
+    Args:
+        coro: The coroutine to schedule.
+        task_name: Human-readable name for log messages.
+                   Defaults to the coroutine's __qualname__.
+
+    Returns:
+        The created asyncio.Task (tracked internally).
+    """
+    name = task_name or getattr(coro, "__qualname__", str(coro))
+
+    async def _wrapped():
+        try:
+            await coro
+        except asyncio.CancelledError:
+            logger.debug(f"Task '{name}' was cancelled")
+            raise  # re-raise so Task.cancelled() works correctly
+        except Exception:
+            logger.error(f"Background task '{name}' failed", exc_info=True)
+
+    task = asyncio.create_task(_wrapped(), name=name)
+    _active_tasks.add(task)
+    task.add_done_callback(_active_tasks.discard)
+    return task