Cardano Updates

The CI deploy job already publishes the built repository to the `repo`
branch. Push the same tree minus the `package/` subdirectory to a new
`index-only` branch so that consumers who only need the index (e.g. a
Nix flake input used to compute a cabal install plan) can avoid the
large tarball download.

The filtered tree is recomputed via `git ls-tree | git mktree` so we
don't touch the working tree.

Second iteration of `transaction validate`

Signed-off-by: Chris Guiney <[email protected]>

Second iteration of `transaction validate`

Add re-exports for ApplyTxError(..), ConwayLedgerPredFailure(..),
ConwayUtxowPredFailure(..), ConwayUtxoPredFailure(..), Mismatch(..),
and hashToTextAsHex so downstream consumers (cardano-cli) can
pattern-match on ledger predicate failures for human-readable
error rendering.

Runs both applyTx (phase 1) and evaluateTransactionExecutionUnits (phase 2)
independently in a single LocalStateQueryExpr session, returning both results
via TxValidationResult.

Adds a new local state query that runs applyTx against the current
ledger state and returns the raw result. The provisional implementation
queries the full EpochState and runs applyTx client-side; this will be
replaced by a dedicated node-side consensus query.

Exposed from Cardano.Api.Query alongside other queries.

Signed-off-by: Chris Guiney <[email protected]>