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4,359 commits this week May 05, 2026 - May 12, 2026
Add ToJSON/FromJSON instances for Shelley era transaction types
Add JSON serialisation instances for all types composing `Tx TopTx ShelleyEra`:
- `cardano-ledger-core`: `TxIn`, `TxId`, `Metadatum`, `WitVKey`,
  `BootstrapWitness`, `Addr`, `RewardAccount`, `ScriptHash` (ToJSONKey/FromJSONKey)
- `cardano-ledger-shelley`: `ShelleyTx`, `ShelleyTxBody`, `ShelleyTxWits`,
  `ShelleyTxAuxData`, `ShelleyTxOut`, `MultiSig`, `Update`, `ProposedPPUpdates`

Conventions followed:
- `kindObject` for sum types
- `ToKeyValuePairs` + `deriving via KeyValuePairs` for product types
- TxIn serialised as "TxIx#TxIx" text key
- Map fields serialised as JSON objects (not lists of pairs)

Add golden JSON test for `Tx TopTx ShelleyEra` at `eras/shelley/impl/golden/tx.json`.
Drop redundant PParamsUpdate round-trip in update proposal flow
`makeShelleyUpdateProposal` (cardano-api ^>=11.1) accepts
`EraBasedProtocolParametersUpdate era` directly. The existing code in
`shelleyToBabbageProtocolParametersUpdate` constructed that value,
converted it to the deprecated `ProtocolParametersUpdate` via
`createEraBasedProtocolParamUpdate` / `fromLedgerPParamsUpdate`, and
passed the result to `makeShelleyUpdateProposal` — an unnecessary
round-trip through the old API.

Drop the conversion; pass `eraBasedPParams` directly. No behaviour
change.