fix(mbe): forward walletPubs in consolidateUnspents and accelerate

consolidateUnspents and accelerate were failing for UTXO coins with
"pubs are required for fixed script signing" after the SDK bump added
assert(params.pubs) in abstract-utxo BitGoPsbt signing path.

Update makeCustomSigningFunction to accept and forward walletPubs to
awmClient.signMultisig. Update handleConsolidateUnspents and
handleAccelerate to fetch all 3 keychains (user, backup, bitgo) and
pass them as walletPubs, matching the sendMany flow.

Ticket: WCN-447
Session-Id: 79c78e55-7d60-4e54-b656-da465c33eb23
Task-Id: 7abc45de-23d0-4914-8dad-885882f82710

Author: pranavjain97

src/masterBitgoExpress/handlers/handleAccelerate.ts

@@ -13,7 +13,7 @@ export async function handleAccelerate(
   const walletId = req.params.walletId;
   const coin = req.params.coin;
 
-  const { wallet, signingKeychain } = await getWalletAndSigningKeychain({
+  const { baseCoin, wallet, signingKeychain } = await getWalletAndSigningKeychain({
     bitgo,
     coin,
     walletId,
@@ -22,12 +22,23 @@ export async function handleAccelerate(
     KeyIndices,
   });
 
+  const [userKeychain, backupKeychain, bitgoKeychain] = await Promise.all([
+    baseCoin.keychains().get({ id: wallet.keyIds()[KeyIndices.USER] }),
+    baseCoin.keychains().get({ id: wallet.keyIds()[KeyIndices.BACKUP] }),
+    baseCoin.keychains().get({ id: wallet.keyIds()[KeyIndices.BITGO] }),
+  ]);
+  const walletPubs =
+    userKeychain?.pub && backupKeychain?.pub && bitgoKeychain?.pub
+      ? [userKeychain.pub, backupKeychain.pub, bitgoKeychain.pub]
+      : undefined;
+
   try {
     // Create custom signing function that delegates to EBE
     const customSigningFunction = makeCustomSigningFunction({
       awmClient,
       source: params.source,
       pub: signingKeychain.pub!,
+      walletPubs,
     });
 
     // Prepare acceleration parameters

src/masterBitgoExpress/handlers/handleConsolidateUnspents.ts

@@ -13,7 +13,7 @@ export async function handleConsolidateUnspents(
   const walletId = req.params.walletId;
   const coin = req.params.coin;
 
-  const { wallet, signingKeychain } = await getWalletAndSigningKeychain({
+  const { baseCoin, wallet, signingKeychain } = await getWalletAndSigningKeychain({
     bitgo,
     coin,
     walletId,
@@ -22,12 +22,23 @@ export async function handleConsolidateUnspents(
     KeyIndices,
   });
 
+  const [userKeychain, backupKeychain, bitgoKeychain] = await Promise.all([
+    baseCoin.keychains().get({ id: wallet.keyIds()[KeyIndices.USER] }),
+    baseCoin.keychains().get({ id: wallet.keyIds()[KeyIndices.BACKUP] }),
+    baseCoin.keychains().get({ id: wallet.keyIds()[KeyIndices.BITGO] }),
+  ]);
+  const walletPubs =
+    userKeychain?.pub && backupKeychain?.pub && bitgoKeychain?.pub
+      ? [userKeychain.pub, backupKeychain.pub, bitgoKeychain.pub]
+      : undefined;
+
   try {
     // Create custom signing function that delegates to EBE
     const customSigningFunction = makeCustomSigningFunction({
       awmClient,
       source: params.source,
       pub: signingKeychain.pub!,
+      walletPubs,
     });
 
     // Prepare consolidation parameters

src/masterBitgoExpress/handlers/utils/utils.ts

@@ -65,16 +65,19 @@ export function makeCustomSigningFunction({
   awmClient,
   source,
   pub,
+  walletPubs,
 }: {
   awmClient: AdvancedWalletManagerClient;
   source: 'user' | 'backup';
   pub: string;
+  walletPubs?: string[];
 }): CustomSigningFunction {
   return async function customSigningFunction(signParams: any) {
     return awmClient.signMultisig({
       txPrebuild: signParams.txPrebuild,
       source,
       pub,
+      walletPubs,
     });
   };
 }