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

Both create-staked and create-testnet-data now leave files under a single layout:
genesis.<era>.json plus pools-keys/poolN/{cold,kes,vrf,opcert}.{skey,vkey,cert,counter}, stake-delegators/, byron-gen-command/, drep-keys/, utxo-keys/.

- Adds normalize-create-staked-output to reshape create-staked's flat pools/coldN.skey layout into create-testnet-data's pools-keys/poolN/ subdirs, and to generate genesis.byron.json from 'genesis spec byron'.
- create-testnet-data drops its symlink-creation block and link_keys helper, renaming <era>-genesis.json -> genesis.<era>.json in place.
- Removes Massage_the_key_file_layout_to_match_AWS, key_depl, key_genesis.
- derive-from-cache-jq symlinks the new key dirs and patches the renamed genesis.byron.json.

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

derive-from-cache-jq produces $dir/byron/genesis.json from 'genesis spec byron' piped through 'jq .startTime = $start', matching how shelley/alonzo/conway are patched.

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

derive-from-cache becomes a backend dispatch case

The case body and the previously-separate finalise-cache-entry case are inlined into derive-from-cache-jq, derive-from-cache-modular delegates to jq.

actually-genesis now invokes "genesis-create-$genesis_backend"

genesis-create-jq holds the WB_CREATE_TESTNET_DATA branch and genesis-create-modular delegates to jq (modular only replaces spec/cache-key generation, not the create-testnet-data call)

Resolve $genesis_backend once at source time and replace the per-case 'if WB_MODULAR_GENESIS' branches for profile-cache-key-input, profile-cache-key, spec and pool-relays with a single "X-$genesis_backend" "$@" dispatch.

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