chore: note end-hash check gas trade-off and trim test describe labels

Author: spalladino

l1-contracts/src/core/libraries/rollup/EpochProofLib.sol

@@ -296,6 +296,8 @@ library EpochProofLib {
       // proof's public inputs, so nothing else pins where the segment begins. The end is already pinned transitively
       // (the checkpoint root binds end_inbox_rolling_hash to the last checkpoint header, whose hash verifyHeaders ties
       // to storage), so checking it here only trades a bare proof-verification failure for a specific error.
+      // The end check is therefore a deliberate gas-for-diagnostics trade: it costs one cold SLOAD (2,100 gas per
+      // submission) and can be deleted if the submit path ever needs trimming.
       {
         bytes32 expectedPreviousInboxRollingHash = STFLib.getInboxRollingHash(_start - 1);
         require(

yarn-project/stdlib/src/p2p/block_proposal.test.ts

@@ -116,7 +116,7 @@ describe('Block Proposal serialization / deserialization', () => {
     expect(tampered.getSender()).toBeUndefined();
   });
 
-  describe('bucket reference (AZIP-22 Fast Inbox)', () => {
+  describe('bucket reference', () => {
     it('round-trips with a bucket reference set', async () => {
       const bucketRef = InboxBucketRef.random();
       const proposal = await makeBlockProposal({ bucketRef });

yarn-project/stdlib/src/p2p/checkpoint_proposal.test.ts

@@ -43,7 +43,7 @@ describe('CheckpointProposal serialization / deserialization', () => {
     expect(deserialized.toBuffer()).toEqual(proposal.toBuffer());
   });
 
-  describe('bucket reference (AZIP-22 Fast Inbox)', () => {
+  describe('bucket reference', () => {
     it('round-trips with a bucket reference on the last block', async () => {
       const checkpointHeader = CheckpointHeader.random();
       const bucketRef = new InboxBucketRef(17n, 1_700_000_000n, checkpointHeader.inboxRollingHash);