[antithesis] lower checkpoint split limit for reachability assert

Author: alex-mysten

crates/sui-protocol-config/src/lib.rs

@@ -4550,6 +4550,12 @@ impl ProtocolConfig {
             // in the quarantine output.
         }
 
+        // Antithesis specific overrides.
+        #[cfg(not(msim))]
+        if mysten_common::in_antithesis() {
+            cfg.max_transactions_per_checkpoint = Some(100);
+        }
+
         cfg
     }
 
@@ -4864,6 +4870,7 @@ impl ProtocolConfig {
         self.feature_flags.enable_authenticated_event_streams = true;
         self.feature_flags
             .include_checkpoint_artifacts_digest_in_summary = true;
+        self.feature_flags.split_checkpoints_in_consensus_handler = true;
     }
 
     pub fn disable_authenticated_event_streams_for_testing(&mut self) {