A Supervisor that owns a single transport's connection process and its associated worker pool.

One ConnectionSupervisor is started per configured transport:

TransportSupervisor (one_for_one root)
└── ConnectionSupervisor(:rabbitmq)   ← this module
      ├── Transport.RabbitMQ           ← connection GenServer
      └── WorkerPool(:rabbitmq_pool)   ← message processing pool

The :rest_for_one strategy means: if the connection dies, the worker pool is restarted too (workers hold references to the connection channel). If only the pool dies, the connection is left intact.