Cardano Updates

Add a test for ensuring that a peer can download all valid TXs when
faced with two peers with conflicting tx order.

Co-authored-by: teodanciu <[email protected]>

chore: update MSRV and check nightly version in AGENTS.md

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Add batch-wide withdrawal bound check to prevent phantom asset attacks
when nested transactions combine deposits and withdrawals.

`Transaction.lagda.md`:
+  Define allWithdrawals batch aggregation helper (mirrors
   allDirectDeposits)

`Utxo.lagda.md`:
+  Define NoPhantomWithdrawals predicate using allWithdrawals
+  Add NoPhantomWithdrawals premise to UTXO rule
+  Document phantom asset attack and spend-side safety analogy

`Utxo/Properties/Computational.lagda.md`:
+  Update Computational-UTXO for new premise tuple arity (21+h → 22+h)

After all sub-rule transitions (`SUBLEDGERS`, `CERTS`, `GOVS`, `UTXOW`),
apply batch-wide direct deposits to the final CertState via
`applyDirectDeposits` and `allDirectDeposits`.

`Ledger.lagda.md`:
+  Update `LEDGER-V` output: compute `certStateFinal` by applying
   `allDirectDeposits` to `certState₂`, use `certStateFinal` in the
   output `LedgerState` and in `rmOrphanDRepVotes`;
+  `LEDGER-I` unchanged (invalid batches don't apply deposits);
+  Document direct deposit application ordering and phantom asset
   prevention rationale.

`Ledger/Properties/Computational.lagda.md`:
+  Update `computeProof` valid branch to compute `certStateFinal` and use
   it in the output `LedgerState`.

After all sub-rule transitions (`SUBLEDGERS`, `CERTS`, `GOVS`, `UTXOW`),
apply batch-wide direct deposits to the final CertState via
`applyDirectDeposits` and `allDirectDeposits`.

`Ledger.lagda.md`:
+  Update `LEDGER-V` output: compute `certStateFinal` by applying
   `allDirectDeposits` to `certState₂`, use `certStateFinal` in the
   output `LedgerState` and in `rmOrphanDRepVotes`;
+  `LEDGER-I` unchanged (invalid batches don't apply deposits);
+  Document direct deposit application ordering and phantom asset
   prevention rationale.

`Ledger/Properties/Computational.lagda.md`:
+  Update `computeProof` valid branch to compute `certStateFinal` and use
   it in the output `LedgerState`.

CIP-159 changes the transaction balancing rules and introduces Phase-1
balance interval validation.  This commit updates the UTxO transition
system accordingly.

`Utxo.lagda.md`:
+  Add accountBalances : Rewards field to UTxOEnv and SubUTxOEnv for
   pre-batch account balance lookups;
+  Add HasAccountBalances type class and instances;
+  Update producedTx to include direct deposit amounts on the produced
   side of the preservation-of-value equation;
+  Add direct deposit registration premise to UTXO and SUBUTXO
   (`dom DirectDepositsOf ⊆ dom AccountBalancesOf`);
+  Add balance interval validation premise to UTXO and SUBUTXO
   (∀ (c,interval) ∈ BalanceIntervalsOf, InBalanceInterval using
   pre-batch account balances).

`Utxo/Properties/Computational.lagda.md`:
+  Update Computational-UTXO for new premise tuple arity (19+h → 21+h)

`Ledger.lagda.md`:
+  Add accountBalances field to SubLedgerEnv;
+  Populate accountBalances in SUBLEDGER-V, SUBLEDGER-I, LEDGER-V,
   LEDGER-I using RewardsOf certState₀ (pre-batch balances).

After all sub-rule transitions (`SUBLEDGERS`, `CERTS`, `GOVS`, `UTXOW`),
apply batch-wide direct deposits to the final CertState via
`applyDirectDeposits` and `allDirectDeposits`.

`Ledger.lagda.md`:
+  Update `LEDGER-V` output: compute `certStateFinal` by applying
   `allDirectDeposits` to `certState₂`, use `certStateFinal` in the
   output `LedgerState` and in `rmOrphanDRepVotes`;
+  `LEDGER-I` unchanged (invalid batches don't apply deposits);
+  Document direct deposit application ordering and phantom asset
   prevention rationale.

`Ledger/Properties/Computational.lagda.md`:
+  Update `computeProof` valid branch to compute `certStateFinal` and use
   it in the output `LedgerState`.
+  Clean up redundant code.