cardano-db-tool: are `create-migration` and `validate-address-balance` intended to stay unimplemented after the Hasql rewrite?

# [QUESTION] cardano-db-tool: are `create-migration` and `validate-address-balance` intended to stay unimplemented after the Hasql rewrite?

**Type:** Question / clarification (not filed as a bug - likely known WIP).

**Affected:** cardano-db-tool 13.7.2.1 (verified at HEAD).

Two subcommands are live no-op stubs after the Persistent -> Hasql rewrite:

## `create-migration`
```
Warning: createMigration not implemented for Hasql. Manual migration creation required.
No migration needed.
```
- `cardano-db/src/Cardano/Db/Migration.hs:221`, called from `cardano-db-tool/app/cardano-db-tool.hs:74`

## `validate-address-balance`
```
Found N snapshots. Ledger validation not yet reimplemented for consensus snapshot format.
```
- `cardano-db-tool/src/Cardano/DbTool/Validate/Ledger.hs:41`

## Questions
1. Are these planned to be reimplemented, or intentionally retired on the Hasql line?
2. If retired, should they be removed from the CLI (rather than printing a stub) and/or documented as unavailable?
3. `create-migration` is a dev-only helper; is manual migration authoring now the expected workflow (worth a doc note if so)?

Read cardano-db/src/Cardano/Db/Migration.hs:221 and its call from cardano-db-tool/app/cardano-db-tool.hs:74, then inspect cardano-db-tool/src/Cardano/DbTool/Validate/Ledger.hs:41. Confirm whether each command is planned, retired, or intentionally manual-only. Done requires a maintainer decision and corresponding CLI removal or documentation scope, rather than implementing an unspecified behavior.

Written by the indexing model from the issue text.