Cardano Updates

- Separates cost models from the rest of the parameters
- Uses an object for the cost model instead of an array

Were removed when the node started only considering valid what mainnet shipped with

spec-jq gets a dijkstra) case sourcing the zero preset's dijkstra-genesis.json; spec-modular falls back to jq for dijkstra since the Nix modules don't cover it yet

The pool relays we wrote into the Shelley genesis (via `pool-relays.json` and `cardano-cli ... --relays` / `--relay-specification-file`) are only consumed by ledger-peer discovery.

With ledger peers off and `publicRoots` empty, the relay records in genesis are never read.

Every workbench topology disables it:
- the supervisor (local / 127.0.0.1) backend gets `useLedgerAfterSlot: -1` from `cardano-topology projection-for`.
- the Nomad backend hardcodes the same value (nix/workbench/backend/nomad-job.nix).

Replace 'cardano-cli byron genesis genesis' with a jq blob in spec-jq's new byron) case.

Removes genesis-byron-{jq,modular} and the genesis-byron dispatcher.

Every era's genesis file is now genesis.<era>.json everywhere: genesis.byron.json, genesis.shelley.json, genesis.alonzo.json, genesis.conway.json, genesis.dijkstra.json.

Was converging to `create-staked` output, keep `create-testnet-data` layout:
- pools-keys/poolN/{cold,kes,vrf,opcert}.{skey,vkey,cert,counter}
- stake-delegators/delegatorN/{payment,staking}.{skey,vkey}
- drep-keys/drepN/drep.{skey,vkey}
- utxo-keys/utxoN/utxo.{skey,vkey}
- genesis-keys/genesisN/key.{skey,vkey}
- delegate-keys/delegateN/{key,kes,vrf,opcert}.{skey,vkey,cert,counter}
- byron-gen-command/

Details:
- create-testnet-data drops its symlink-creation block and the `link_keys` helper (no longer needed under the native layout).
- Removes `Massage_the_key_file_layout_to_match_AWS`, `key_depl` and `key_genesis`.

Genesis file names are unchanged here.

- Separates cost models from the rest of the parameters
- Uses an object for the cost model instead of an array

Were removed when the node started only considering valid what mainnet shipped with

spec-jq gets a dijkstra) case sourcing the zero preset's dijkstra-genesis.json; spec-modular falls back to jq for dijkstra since the Nix modules don't cover it yet