Cardano Updates

Signed-off-by: Akhil Repala <[email protected]>

Document that the Cardano Foundation also runs a preprod instance of the
Token Metadata Server, which sources CIP-68 metadata on-chain from preprod
and CIP-26 metadata from the IOHK metadata-registry-testnet repository.

Co-authored-by: Mateusz Czeladka <[email protected]>
Co-authored-by: Claude Opus 4.8 (1M context) <[email protected]>

Bumps [actions/checkout](https://github.com/actions/checkout) from 6.0.2 to 6.0.3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/de0fac2e4500dabe0009e67214ff5f5447ce83dd...df4cb1c069e1874edd31b4311f1884172cec0e10)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Fix order of arguments in user guide example

Update the governance enhancement plans for DRep Discovery UX
refinement feedback provided from initial goverance review and
discussions. Add ux, design, and external research supporting material
for UX implementation.

Document that the Cardano Foundation also runs a preprod instance of the
Token Metadata Server, which sources CIP-68 metadata on-chain from preprod
and CIP-26 metadata from the IOHK metadata-registry-testnet repository.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

Update Blockfrost from 6.4.0 to 6.4.3
Update Cardano CLI from 10.15.1.0 to 11.0.0.0
Update Cardano DB Sync from 13.6.0.4 to 13.7.1.0
Update Cardano TX Generator from 10.6.4 to 11.0.1
Update Debian from stable-20260421-slim to stable-20260518-slim
Update Grafana from 13.0.1 to 13.0.2
Update Jaeger from 2.17.0 to 2.18.0
Update Loki from 3.7.1 to 3.7.2
Update PostgreSQL from 17.9 to 17.10
Update Prometheus from 3.11.2 to 3.12.0
Update Yaci Store from 2.0.0 to 2.0.1
Update uv from 0.11.7 to 0.11.18

- 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.