Cardano Updates

utxoFromMempool initialized with UTxOInBabbageEra, causing all
evaluations to hit the Babbage rejection branch even for Conway
transactions. Changed to UTxOInConwayEra.

Reorder deserialiseCBOR to try Conway and Dijkstra before Babbage.
Conway transactions can successfully deserialize as Babbage (the
Babbage decoder accepts Conway-era CBOR), wrapping them as
GenTxBabbage and rejecting them as "unsupported era". Older eras
kept as fallbacks for specific diagnostics.

Use eraProtVerHigh in transaction deserialization to accept
transactions from any protocol version within an era (e.g.
Conway PV9 through PV11).

Co-Authored-By: Claude <[email protected]>

Prefer oneOf vs anyOf for the interval representations.
Use mutual exclusion (not/required) to make oneOf entries
non-overlapping when both bounds are present.

Co-Authored-By: Claude <[email protected]>

Schema fixes for Dijkstra-era validation:
- Add SubmitTransactionFailure entries: 3169 (PointerAddressInCollateralReturn),
  3170 (SpendingOutputFromSubTransaction)
- Add ScriptPurpose<Guard> and Clause<Guard> to cardano.json
- Fix AccountBalanceInterval: use anyOf instead of oneOf
- Make ProposedProtocolParameters minFeeReferenceScripts sub-fields optional

Enable Dijkstra ApplyTxError generator and Dijkstra GenTx generator.
GenTx uses genDijkstraShelleyTx which strips sub-transactions to
avoid MemoBytes CBOR round-trip failures in mock protocol peers.

Dijkstra block generation remains excluded: randomly generated blocks
fail CBOR round-tripping in the ChainSync mock peer, likely due to
block header/body hash inconsistency. The consensus codec itself
supports Dijkstra's 5-segment block body.

Add test dependencies: cardano-data, cardano-ledger-dijkstra:testlib.
Import Dijkstra Arbitrary instances.

Co-Authored-By: Claude <[email protected]>

- Add GenTxIdDijkstra to genGenTxId
- Add Dijkstra context error to genContextError
- Add Dijkstra-era MissingScript to genScriptFailure
- Add "guard" to script purpose enum in cardano.json
- Remove stale FIXME comment in Generators.hs
- Regenerate EvaluateTransactionResponse test vectors

Co-Authored-By: Claude <[email protected]>

Add schema definitions for new Dijkstra era fields:
- Transaction: requiredExtraGuards, directDeposits,
  accountBalanceIntervals, subTransactions, requiredTopLevelGuards
- ProtocolParameters: maxReferenceScriptsSizePerBlock
- New types: AccountBalanceInterval (with oneOf for bound variants),
  TopLevelGuard, SubTransaction

New JSON field names introduced across all Dijkstra commits:

  Transaction body (TopTx):
  - requiredExtraGuards: script hash guards (new Dijkstra field)
  - directDeposits: account address to coin map
  - accountBalanceIntervals: list of interval constraints per account
  - subTransactions: nested sub-transactions
  - fee: moved to TopTx-only (SubTx has no fee)

  Transaction body (SubTx):
  - requiredTopLevelGuards: guard credentials with optional datums

  AccountBalanceInterval fields:
  - greaterThanOrEqualTo: inclusive lower bound (coin)
  - strictlyLessThan: exclusive upper bound (coin)

  TopLevelGuard fields:
  - credential: guard credential (key hash or script hash)
  - datum: optional inline datum

  ProtocolParameters:
  - maxReferenceScriptsSizePerBlock: new Dijkstra param

  Script purpose enum:
  - "guard": new Dijkstra script purpose

  Error codes:
  - 3169: PointerAddressInCollateralReturn
  - 3170: SpendingOutputFromSubTransaction

Co-Authored-By: Claude <[email protected]>

Co-Authored-By: Claude <[email protected]>

Both full PParams and PParamsUpdate nest range and multiplier inside
minFeeReferenceScripts to preserve Conway's API shape. For full
PParams, all three sub-fields are always present. For updates, only
the sub-fields being updated are included, and the key is omitted
entirely when none of the three are updated.

Co-Authored-By: Claude <[email protected]>

Gate Dijkstra behind nodeToClientV > V_23 since V_23 is the latest
NodeToClientVersion in ouroboros-consensus 3.0.1.0 and is negotiated
by all networks with node 11.0.1.

On Dijkstra networks (future V_24+), Dijkstra is tried first. On
Conway networks, Conway is tried first. Each list is ordered from
most probable era to least probable.

Verified on preview and preprod that GenTxIdDijkstra does not crash
the node (returns false, loop continues), so this is a performance
optimization to avoid unnecessary round-trips on non-Dijkstra
networks.

Co-Authored-By: Claude <[email protected]>

Prefer oneOf vs anyOf for the interval representations.
Use mutual exclusion (not/required) to make oneOf entries
non-overlapping when both bounds are present.

Co-Authored-By: Claude <[email protected]>

Schema fixes for Dijkstra-era validation:
- Add SubmitTransactionFailure entries: 3169 (PointerAddressInCollateralReturn),
  3170 (SpendingOutputFromSubTransaction)
- Add ScriptPurpose<Guard> and Clause<Guard> to cardano.json
- Fix AccountBalanceInterval: use anyOf instead of oneOf
- Make ProposedProtocolParameters minFeeReferenceScripts sub-fields optional

Enable Dijkstra ApplyTxError generator and Dijkstra GenTx generator.
GenTx uses genDijkstraShelleyTx which strips sub-transactions to
avoid MemoBytes CBOR round-trip failures in mock protocol peers.

Dijkstra block generation remains excluded: randomly generated blocks
fail CBOR round-tripping in the ChainSync mock peer, likely due to
block header/body hash inconsistency. The consensus codec itself
supports Dijkstra's 5-segment block body.

Add test dependencies: cardano-data, cardano-ledger-dijkstra:testlib.
Import Dijkstra Arbitrary instances.

Co-Authored-By: Claude <[email protected]>

- Add GenTxIdDijkstra to genGenTxId
- Add Dijkstra context error to genContextError
- Add Dijkstra-era MissingScript to genScriptFailure
- Add "guard" to script purpose enum in cardano.json
- Remove stale FIXME comment in Generators.hs
- Regenerate EvaluateTransactionResponse test vectors

Co-Authored-By: Claude <[email protected]>

Add schema definitions for new Dijkstra era fields:
- Transaction: requiredExtraGuards, directDeposits,
  accountBalanceIntervals, subTransactions, requiredTopLevelGuards
- ProtocolParameters: maxReferenceScriptsSizePerBlock
- New types: AccountBalanceInterval (with oneOf for bound variants),
  TopLevelGuard, SubTransaction

New JSON field names introduced across all Dijkstra commits:

  Transaction body (TopTx):
  - requiredExtraGuards: script hash guards (new Dijkstra field)
  - directDeposits: account address to coin map
  - accountBalanceIntervals: list of interval constraints per account
  - subTransactions: nested sub-transactions
  - fee: moved to TopTx-only (SubTx has no fee)

  Transaction body (SubTx):
  - requiredTopLevelGuards: guard credentials with optional datums

  AccountBalanceInterval fields:
  - greaterThanOrEqualTo: inclusive lower bound (coin)
  - strictlyLessThan: exclusive upper bound (coin)

  TopLevelGuard fields:
  - credential: guard credential (key hash or script hash)
  - datum: optional inline datum

  ProtocolParameters:
  - maxReferenceScriptsSizePerBlock: new Dijkstra param

  Script purpose enum:
  - "guard": new Dijkstra script purpose

  Error codes:
  - 3169: PointerAddressInCollateralReturn
  - 3170: SpendingOutputFromSubTransaction

Co-Authored-By: Claude <[email protected]>

Co-Authored-By: Claude <[email protected]>

Both full PParams and PParamsUpdate nest range and multiplier inside
minFeeReferenceScripts to preserve Conway's API shape. For full
PParams, all three sub-fields are always present. For updates, only
the sub-fields being updated are included, and the key is omitted
entirely when none of the three are updated.

Co-Authored-By: Claude <[email protected]>

The node throws an exception if sent a GenTxId for an era that
hasn't hard-forked yet (see b62f0a4e). Gate Dijkstra behind
nodeToClientV >= V_23 since V_22 is the latest released version
and Dijkstra is only reachable on experimental testnets.

On Dijkstra networks (V_23+), Dijkstra is tried first. On Conway
networks, Conway is tried first. Each list is ordered from most
probable era to least probable.

Note: V_23 is a proxy for "has the Dijkstra hard fork happened",
not a protocol-level gate. The ShelleyBlock SupportedNetworkProtocolVersion
instance includes all eras at all versions (TODO #2668 in
ouroboros-consensus to make it era-specific).

Co-Authored-By: Claude <[email protected]>

Rename lowerBound/upperBound to greaterThanOrEqualTo/strictlyLessThan
to make the inclusive/exclusive semantics explicit in the JSON field
names.

Co-Authored-By: Claude <[email protected]>

Preserves the existing requiredExtraSignatories field by filtering
guard credentials to key hashes only (matching reqSignerHashesTxBodyG).
Script hash guards are exposed via a new requiredExtraGuards field.

Co-Authored-By: Claude <[email protected]>

Co-Authored-By: Claude <[email protected]>

- Extract shared TxBody fields into encodeSharedTxBody
- Add encodeSubTx and encodeSubTxBody for Tx SubTx DijkstraEra
- Encode requiredTopLevelGuards in sub-transaction bodies
- Pass MetadataFormat through encodeTxBody for sub-tx metadata

Note: TopTx-only fields (collaterals, fee) are appended after
shared fields rather than interleaved in Conway's original order.
This is a trade-off for code sharing via encodeSharedTxBody —
JSON objects are unordered by spec so no client impact.

Co-Authored-By: Claude <[email protected]>

- Extract shared TxBody fields into encodeSharedTxBody
- Add encodeSubTx and encodeSubTxBody for Tx SubTx DijkstraEra
- Encode requiredTopLevelGuards in sub-transaction bodies
- Pass MetadataFormat through encodeTxBody for sub-tx metadata

Co-Authored-By: Claude <[email protected]>

- Replace downgradePParamsHKD with native encoder exposing real
  Dijkstra ref-script parameters (refScriptCostStride,
  refScriptCostMultiplier, maxRefScriptSizePerTx,
  maxRefScriptSizePerBlock)
- Wire up guards field via guardsTxBodyL replacing reqSignerHashesTxBodyL
- Wire up directDeposits and accountBalanceIntervals TxBody fields
- Fix DijkstraUnRegCert incorrectly mapped to ConwayRegCert
- Fix stale module comment referencing CBOR roundtrip

Co-Authored-By: Claude <[email protected]>

The GetDRepDelegations patch history note is better suited to
commit message than an inline comment that will lack context over time.

The SRPs were removed and are now obtained directly from CHaP.

Co-Authored-By: Claude <[email protected]>