feat: merge-train/spartan-v5 (#24677)

See
[merge-train-readme.md](https://github.com/AztecProtocol/aztec-packages/blob/next/.github/workflows/merge-train-readme.md).
This is a merge-train.

Author: AztecBot

yarn-project/end-to-end/src/multi-node/block-production/proof_boundary.parallel.test.ts

@@ -58,9 +58,10 @@ describe('multi-node/block-production/proof_boundary', () => {
 
     const minTxsPerBlock = validatorOverrides.minTxsPerBlock ?? 0;
     const maxTxsPerBlock = validatorOverrides.maxTxsPerBlock ?? 1;
-    logger.warn(`Initial setup complete. Starting ${NODE_COUNT} validator nodes.`);
+    logger.warn(`Initial setup complete. Creating ${NODE_COUNT} validator nodes with sequencers paused.`);
+    // Ensure every validator can handle the first proposal before any sequencer begins its polling loop.
     nodes = await asyncMap(validators, ({ privateKey }) =>
-      test.createValidatorNode([privateKey], { minTxsPerBlock, maxTxsPerBlock }),
+      test.createValidatorNode([privateKey], { dontStartSequencer: true, minTxsPerBlock, maxTxsPerBlock }),
     );
 
     proverNode = await test.createProverNode({
@@ -73,6 +74,11 @@ describe('multi-node/block-production/proof_boundary', () => {
     logger.warn(`Test setup completed.`, { validators: validators.map(v => v.attester.toString()) });
   };
 
+  const startSequencers = async () => {
+    await test.startSequencers(nodes);
+    logger.warn(`Started ${NODE_COUNT} validator sequencers.`);
+  };
+
   const collectSequencerEvents = (sequencers: SequencerClient[]) => {
     const published: PublishedEvent[] = [];
     const preparing: PreparingEvent[] = [];
@@ -216,6 +222,7 @@ describe('multi-node/block-production/proof_boundary', () => {
 
     const sequencers = nodes.map(node => node.getSequencer()!);
     const events = collectSequencerEvents(sequencers);
+    await startSequencers();
 
     const { boundarySlot, boundaryTs } = await computeBoundarySlot();
 
@@ -264,6 +271,7 @@ describe('multi-node/block-production/proof_boundary', () => {
 
     const sequencers = nodes.map(node => node.getSequencer()!);
     const events = collectSequencerEvents(sequencers);
+    await startSequencers();
 
     const { boundarySlot, boundaryTs } = await computeBoundarySlot();
 
@@ -298,6 +306,7 @@ describe('multi-node/block-production/proof_boundary', () => {
 
     const sequencers = nodes.map(node => node.getSequencer()!);
     const events = collectSequencerEvents(sequencers);
+    await startSequencers();
 
     const { boundarySlot, boundaryEpoch } = await computeBoundarySlot();
 
@@ -335,6 +344,7 @@ describe('multi-node/block-production/proof_boundary', () => {
 
     const sequencers = nodes.map(node => node.getSequencer()!);
     const events = collectSequencerEvents(sequencers);
+    await startSequencers();
 
     const { boundarySlot } = await computeBoundarySlot();
     const slotN = SlotNumber(Number(boundarySlot) - 1);
@@ -374,6 +384,7 @@ describe('multi-node/block-production/proof_boundary', () => {
 
     const sequencers = nodes.map(node => node.getSequencer()!);
     const events = collectSequencerEvents(sequencers);
+    await startSequencers();
 
     const { boundarySlot } = await computeBoundarySlot();
     const slotN = SlotNumber(Number(boundarySlot) - 1);