Individual worker process for executing tasks.

Workers are managed by the WorkerPool and execute tasks one at a time. When a task completes, the worker notifies the pool that it's available for more work.

Lifecycle

1. Worker starts in idle state
2. Pool assigns a task via execute/2
3. Worker executes the task
4. Worker notifies pool when done
5. Returns to idle state

Error Handling

If a task raises an exception, the worker catches it, logs the error, and continues running. The pool is notified that the worker is done even if the task failed.