fix(ertp): remove unneeded ertp type imports (#10467)

closes: #XXXX
refs: #XXXX

## Description

For some reason, vscode does successfully highlight unused jsdoc type imports

![image](https://github.com/user-attachments/assets/8ba7670d-cde2-4458-b5dc-501b4b315414)

but `yarn lint` does not

![image](https://github.com/user-attachments/assets/1f4769f4-2f85-41f2-886b-9a0e6c5a0078)

This PR started as a drive-by extracted from #10456 , where I noticed that ERTP in particular had some of these. Since #10456 experiments with a variation on ERTP, simplifying it first in harmless ways helps a bit.

### Security Considerations

fewer distractions helps

### Scaling Considerations

none

### Documentation Considerations

none

### Testing Considerations

none

### Upgrade Considerations

In the agoric-sdk repo there are no remaining type imports of the legacy type reexport of `Baggage` from ertp. But if there are such imports in other repos, they will need to be fixed. But this is a static-only issue, not a runtime issue, so it's fine for those repos to be fixed only once they depend on the new `@agoric/ertp` without that legacy reexport.

packages/ERTP/src/amountStore.js

@@ -1,6 +1,6 @@
 import { AmountMath } from './amountMath.js';
 
-/** @import {Amount, AssetKind, AmountValue, AssetKindForValue, AssetValueForKind, Brand, MathHelpers} from './types.js' */
+/** @import {Amount, AssetKind} from './types.js' */
 
 /**
  * @template {AssetKind} [K=AssetKind]

packages/ERTP/src/index.js

@@ -5,12 +5,5 @@ export * from './amountMath.js';
 export * from './issuerKit.js';
 export * from './typeGuards.js';
 
-/**
- * Importing Baggage from `@agoric/ertp` is deprecated. Import Baggage from
- * `@agoric/vat-data` instead
- *
- * @import {Baggage} from '@agoric/vat-data'
- */
-
 // eslint-disable-next-line import/export
 export * from './types-index.js';

packages/ERTP/src/legacy-payment-helpers.js

@@ -7,7 +7,7 @@ import { AmountMath } from './amountMath.js';
 
 /**
  * @import {ERef} from '@endo/far';
- * @import {Amount, AssetKind, AmountValue, AssetKindForValue, Payment, Brand, Purse} from './types.js';
+ * @import {Amount, AssetKind, Payment, Purse} from './types.js';
  */
 
 /**

packages/ERTP/src/purse.js

@@ -4,7 +4,7 @@ import { AmountMath } from './amountMath.js';
 import { makeTransientNotifierKit } from './transientNotifier.js';
 import { makeAmountStore } from './amountStore.js';
 
-/** @import {Amount, AssetKind, AmountValue, AssetKindForValue, RecoverySetsOption, Brand, Payment} from './types.js' */
+/** @import {AssetKind, RecoverySetsOption, Brand, Payment} from './types.js' */
 
 const EMPTY_COPY_SET = makeCopySet([]);
 

packages/ERTP/src/transientNotifier.js

@@ -6,7 +6,7 @@ import { makeNotifierKit } from '@agoric/notifier';
 
 /**
  * @import {Purse} from './types.js';
- * @import {LatestTopic, NotifierRecord} from '@agoric/notifier';
+ * @import {NotifierRecord} from '@agoric/notifier';
  */
 
 // Note: Virtual for high cardinality, but *not* durable, and so