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(** The rollup node keeps the list of dal slots for each block it needs to
    process.  This is to determine whether the inbox for a given block will need
    to be retrieved from the block operations, or from the data availability
    layer after lag levels have passed and the slot for the block has been
    declared available.

    The state of slots per block is persistent.  *)

(** [process_head node_ctxt head] performs the following operations:
    {ul
      {li it reads the attestations for headers published attestation_lag
      levels preceding [head] from the block metadata, determines which
      ones the rollup node will download, and stores the results in
      [Store.Dal_confirmed_slots].}
    }  *)
val process_head : Node_context.rw -> Layer1.head -> unit tzresult Lwt.t