fix: close bucketed cluster config model gaps

src/replay.rs

@@ -519,7 +519,7 @@ pub fn replay_fixed_placement(
     let block_bytes = cfg.model.kv_block_bytes() as f64;
     let l0_cap = (cfg.hardware.hbm_bytes / block_bytes).max(1.0) as usize;
     let l1_cap = (cfg.hardware.dram_bytes / block_bytes).max(1.0) as usize;
-    let num_instances = cfg.cluster.num_instances as usize;
+    let num_instances = cfg.cluster.total_instances() as usize;
     let mut caches: Vec<ReplayInstanceCache> = (0..num_instances)
         .map(|_| ReplayInstanceCache::new(policy, l0_cap, l1_cap))
         .collect();