Supervisor for one Temporalex worker instance.

A worker is a poller + executor bound to one task queue — the deployment topology written down: this node serves these workflows. The minimal spec is just that statement:

{Temporalex.Worker, workflows: [Booking, Waitlist], activities: [Bookings.Activities]}

Everything else is derived:

• task_queue: — read from the workflow modules' use ..., queue: declarations, with a boot error if they disagree (the misrouting bug caught at startup instead of as a silent hang). Stating it explicitly still works and overrides.
• client: — defaults to the app's default client.
• name: — derived from the queue, overridable.