Returns a specification to start this module under a supervisor.

See Supervisor.

@spec connected?() :: boolean()

Checks if Hindsight is currently connected.

@spec start_link(keyword()) :: Supervisor.on_start()

Starts the Hindsight supervisor.

@spec status() :: %{
  connected: boolean(),
  url: String.t() | nil,
  circuit_state: atom(),
  cache_stats: map(),
  buffer_size: non_neg_integer()
}

Returns the current Hindsight status for display.