Cardano Updates

* Add ToJSON/FromJSON and NFData as EraTxAuxData superclass constraints
* Add ToJSON/FromJSON for Metadatum
* Add ToJSON/FromJSON for Data era and PlutusBinary
* Add FromJSON for PoolCert, ConwayGovCert, DijkstraDelegCert, DijkstraTxCert era
* Add ToJSON/FromJSON for ShelleyTxAuxData, AllegraTxAuxData, AlonzoTxAuxData
* Add round-trip JSON property test for TxAuxData era

* Add ToJSON/FromJSON as superclass constraints to EraScript
* Add ToJSON/FromJSON instances for MultiSig, Timelock and DijkstraNativeScript
* Add structured JSON serialisation for native scripts across all eras (Shelley, Allegra, Dijkstra)
* Add ToJSON/FromJSON instances for AlonzoScript with structured JSON format
* Rename kindObject (returning Value) to kindObjectValue; add new kindObject returning Aeson.Object
* Fix shelleyBasedEraNativeScriptToJSON and sizedNativeScriptGens to accept a child continuation to correctly handle nested scripts across eras
* Add round-trip JSON property tests for NativeScript and Script to the shared era spec

* Add ToJSON, FromJSON and NFData as EraTxWits superclass constraints
* Add ToJSON/FromJSON for WitVKey, BootstrapWitness
* Add ToJSONKey/FromJSONKey for AccountId
* Add ToJSON/FromJSON for Inclusive and Exclusive
* Add FromJSON for TxIn; fix txInToText to use unTxIx
* Add FromJSON for PoolCert
* Add ToJSON/FromJSON for ShelleyTxWits era
* Add FromJSON for AsIx, AlonzoPlutusPurpose AsIx, TxDats, Redeemers, AlonzoTxWits
* Add FromJSON for ConwayDelegCert, ConwayGovCert, ConwayTxCert era, ConwayPlutusPurpose
* Add FromJSON for GovActionId, Voter, Vote, VotingProcedure, ProposalProcedure, GovAction, GovPurposeId
* Add ToJSON/FromJSON for AccountBalanceInterval, DijkstraScript
* Add FromJSON for DijkstraDelegCert, DijkstraTxCert era
* Add round-trip JSON property test for TxWits era

* Add FromJSON (TxOut era) as EraTxOut superclass constraint
* Add FromJSON t as Val t superclass constraint
* Add ToJSON/FromJSON for Datum era
* Add FromJSON for ShelleyTxOut, AlonzoTxOut, BabbageTxOut
* Add FromJSON for MaryValue; fix FromJSON/FromJSONKey for AssetName to hex-decode
* Add round-trip JSON property test for TxOut era

Two paired fixes flagged in PR review:

- `vote_threshold()`: `(τ × expected_total_weight) as u64` truncated,
  so a non-exact product like 2.25 became 2 and a τ = 75% quorum
  accepted 2/3 = 67% of weight.  Switched to `.ceil() as u64`; with
  integer weights, the strict-less `voted_weight < threshold` check
  now enforces `Σ weight ≥ τ × total` exactly.  Mirrors the same fix
  in shared-consensus aggregation.

- `expected_total_weight` for `WfaLs`: built from `(persistent_voters
  + non_persistent_voters) as u64`, which truncated f64 sums.  A
  configured 600.7 quietly became 600, and any fractional sub-1
  configuration zeroed the denominator and trivialised the threshold.
  Switched to `.round() as u64` — closest integer matches the
  "expected committee size" semantic.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

`record_vote`'s doc says `Σ weight ≥ τ × expected_total_weight`,
but the integer threshold was computed via `as u64` truncation,
which accepts quorum at less than τ when the product isn't an exact
integer (e.g. total=3, τ=0.75 → 2.25 truncates to 2, so 2/3 = 67%
passes a 75% quorum).

Switch to `.ceil() as u64`. With integer weights and the strict-less
`voted_weight < threshold` check this enforces the documented
inequality exactly.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Keys are generated per network, with a manual addition for "dev" networks (e.g. e2e).

Updates scripts and build process to generate an aggregators list, replacing the genesis verification keys logic. Adjusted related files and output to align with the new structure.

This fixes all new eslint warnings, mostly `react-hooks/set-state-in-effect`

The YAML knob `vote-threshold: u64` (absolute count, mode-dependent
in meaning) is replaced by `quorum-weight-fraction: f64` (always a
fraction). The absolute threshold is derived at config build from
`quorum_weight_fraction × expected_total_weight`, with the
denominator per mode: PV+NPV seats (WfaLs), node count (Everyone),
total active stake (TopStakeFraction).

Default kept at 0.6 (legacy 300/500) in config.default.yaml to
preserve existing-experiment numerics; code default 0.75 (CIP-0164).

For TopStakeFraction, `try_vote_for_endorser_block` emits the
voter's own stake as the per-EB weight (rather than 1). The quorum
check is unchanged in form — `Σ weight ≥ vote_threshold()` — because
the threshold method now returns stake-denominated values.

`SimConfiguration::build` enforces σ_c > τ for TopStakeFraction and
bails with a clear error referencing the PR. Two new tests:
`top_stake_fraction_uses_stake_weighted_quorum` (per-voter weight =
stake, low-stake majority does NOT certify) and
`sim_config_rejects_top_stake_fraction_when_sigma_c_le_tau`.

`shared_consensus.rs` adapter: `derive_quorum_fraction` collapses to
a passthrough; expected_total_weight uses the new helper.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Quorum is now `Σ voter_stake ≥ τ × total_active_stake` under
StakeCentile committee selection. WfaLs and EveryoneVotes keep their
head-count semantics. The aggregator's per-voter weight unit is now
mode-polymorphic — seats for WfaLs, 1 for Everyone, voter stake for
StakeCentile — and the denominator returned by
`committee::expected_total_weight` matches.

`wfa.rs` is renamed to `committee.rs` since wFA^LS is one of three
schemes now, not the only one. `voter_weights` and the `weight`
parameter widen from u32 to u64 so stake values fit; quorum
comparisons follow.

`ElectionsConfig::validate()` enforces σ_c > τ at startup for
StakeCentile (PR #1196 §"Quorum as a stake threshold"); both the
sim-rs adapter and net-rs net-node panic on a misconfigured set.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

shared-consensus: let RB body and EB announcement coexist on overflow