fix(sequencer): fix copilot reviews

lez/chain_state/DESIGN.md

@@ -66,13 +66,19 @@ Shared types moved into the crate: `AcceptOutcome`, `BlockIngestError`,
 `StallReason`, and `Tip`.
 
 ```rust
-struct Tip { block_id: u64, hash: HashType, l1_slot: Slot }
+struct Tip { block_id: u64, hash: HashType }
 
-enum AcceptOutcome { Applied, AlreadyApplied, Parked(BlockIngestError) }
+enum AcceptOutcome {
+    Applied,
+    AlreadyApplied,
+    Parked(BlockIngestError),
+    RetryableFailure(BlockIngestError),
+}
 ```
 
-`Tip` carries `l1_slot` (recorded atomically with the tip) because the anchor /
-chain-consistency logic keys on the inscription slot, not just `(id, hash)`.
+`Tip` will additionally carry `l1_slot` once the anchor layer lands (recorded
+atomically with the tip), because the anchor / chain-consistency logic keys on
+the inscription slot, not just `(id, hash)`.
 
 ## 4. The two-tier `ChainState`
 

lez/storage/src/sequencer/mod.rs

@@ -487,7 +487,9 @@ impl RocksDBIO {
         if !first {
             let last_curr_block = self.get_meta_last_block_in_db()?;
 
-            if block.header.block_id > last_curr_block {
+            // `>=` so a same-height overwrite (a reorg replacing the tip block)
+            // also refreshes the tip hash in `latest_block_meta`.
+            if block.header.block_id >= last_curr_block {
                 self.put_meta_last_block_in_db_batch(block.header.block_id, batch)?;
                 self.put_meta_latest_block_meta_batch(
                     &BlockMeta {

lez/storage/src/sequencer/tests.rs

@@ -105,4 +105,10 @@ fn store_followed_block_overwrites_competing_block_at_same_id() {
     assert_eq!(stored.header.hash, block2b.header.hash);
     assert!(matches!(stored.bedrock_status, BedrockStatus::Pending));
     assert_eq!(stored_balance(&dbio), 300);
+
+    // The tip meta must follow the reorg winner, or a restart seeds the chain
+    // from the orphaned block's hash.
+    let meta = dbio.latest_block_meta().unwrap();
+    assert_eq!(meta.id, 2);
+    assert_eq!(meta.hash, block2b.header.hash);
 }