fix: add toJsonFromWasm adapter and metadata-aware parsing fixes

- update wasm-dot tarball with parse-refactor changes:
  - Material.metadata is string (hex) matching Substrate RPC wire format
  - parseTransaction accepts DotTransaction only (not raw bytes/hex)
  - DotTransaction.fromHex/fromBytes accept material for metadata-aware
    signed extension parsing
  - explainTransaction removed from wasm-dot (now in BitGoJS)
- simplify wasmParser.ts: pass material directly (no type conversion needed)
- remove unused ParsedTransaction import

BTC-0

TICKET: BTC-0

Author: lcovar

modules/sdk-coin-dot/src/lib/transaction.ts

@@ -38,7 +38,7 @@ import {
 } from './iface';
 import { getAddress, getDelegateAddress } from './iface_utils';
 import utils from './utils';
-import { explainDotTransaction } from './wasmParser';
+import { explainDotTransaction, toJsonFromWasm } from './wasmParser';
 import BigNumber from 'bignumber.js';
 import { Vec } from '@polkadot/types';
 import { PalletConstantMetadataV14 } from '@polkadot/types/interfaces';
@@ -162,6 +162,20 @@ export class Transaction extends BaseTransaction {
     if (!this._dotTransaction) {
       throw new InvalidTransactionError('Empty transaction');
     }
+
+    // WASM path for signed tdot transactions — validates WASM parsing against production.
+    // Only for signed txs because toBroadcastFormat() returns the signed extrinsic (parseable).
+    // Unsigned txs return a signing payload (different format), so they use the legacy path.
+    if (this._coinConfig.name === 'tdot' && this._signedTransaction) {
+      return toJsonFromWasm({
+        txHex: this._signedTransaction,
+        material: utils.getMaterial(this._coinConfig),
+        senderAddress: this._sender,
+        coinConfigName: this._coinConfig.name,
+        referenceBlock: this._dotTransaction.blockHash,
+        blockNumber: Number(this._dotTransaction.blockNumber),
+      });
+    }
     const decodedTx = decode(this._dotTransaction, {
       metadataRpc: this._dotTransaction.metadataRpc,
       registry: this._registry,