ETS-backed callback and runtime-call registry for agent streaming.
@spec callbacks(String.t()) :: {:ok, map()} | :error
@spec delete_callbacks(String.t()) :: :ok
@spec delete_runtime_delta_calls(String.t()) :: :ok
@spec ensure_tables!() :: :ok
@spec mark_runtime_delta_call(String.t(), String.t() | nil) :: :ok
@spec put_callbacks(String.t(), map()) :: :ok
@spec runtime_delta_call?(String.t(), String.t() | nil) :: boolean()