Cardano Updates

- Enhanced the condition for determining the minimum ADA needed, ensuring that adaNeeded is updated only when it falls below the calculated minimum.
- This change improves the accuracy of ADA requirements when sending transactions.

added:
* github:input-output-hk/mithril/81d0cef83c409571c3584bc734c8c013eeaffb48#mithril-client-cli
* github:input-output-hk/mithril/81d0cef83c409571c3584bc734c8c013eeaffb48#mithril-signer
removed:
* github:input-output-hk/mithril/7cff813cabd8bd0a1d9204f4e4afbd75b6a75af1#mithril-client-cli
* github:input-output-hk/mithril/7cff813cabd8bd0a1d9204f4e4afbd75b6a75af1#mithril-signer

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

Bumps [github.com/blinklabs-io/gouroboros](https://github.com/blinklabs-io/gouroboros) from 0.145.0 to 0.146.0.
- [Release notes](https://github.com/blinklabs-io/gouroboros/releases)
- [Commits](https://github.com/blinklabs-io/gouroboros/compare/v0.145.0...v0.146.0)

---
updated-dependencies:
- dependency-name: github.com/blinklabs-io/gouroboros
  dependency-version: 0.146.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

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

Also highlight that `getDatum` gets the datum of the spent output (look
up `txin` in the UTxO; if the output stores a datum hash, look it up in
`DataOf tx`). It's a spending-input datum lookup (not a reference-input
datum lookup).

1. Introduce subTx info type (using an alias for `TxInfo` for now).
2. Extend `TxInfo` with field `txInfoSubTxs : Maybe (List SubTxInfo)`.
3. Define a purpose-built builder:

   + Top-level Guard scripts ⇒ `txInfoSubTxs = just (...)`
   + Everything else ⇒ `txInfoSubTxs = nothing`
   + SubTx scripts ⇒ always `nothing` (even for `Guard` at sub level)

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

Key idea:

+  Keep `txGuards` as a set **for now**.
+  Define an ordered view `guardsList : List Credential` via `setToList`.
+  Make `indexOfGuard` operate on that list.
+  Let `rdptr` compute the `Ix` using `indexOfGuard`.

For the "required top-level guards requested by subTxs" (i.e., `txRequiredTopLevelGuards` requests), we don't need a new ScriptPurpose constructor yet, because:

+  phase-1 ensures those requested credentials are contained in top-level `txGuards`
+  the later work (#1004 / #1006) will decide how to construct TxInfo / datum arguments for running those guard scripts batch-wide