fix(cdc): mark truncated table escalated to skip redundant UPDATE tracking

markTableTruncated already leaves every leaf dirty, which is exactly the
adaptive drain's escalated state. Record it in the escalator so UPDATEs
landing on a re-populated table later in the same bounded drain skip
per-PK tracking instead of re-running the threshold count and a redundant
mark-all-dirty. Guarded by esc != nil (nil in continuous mode);
INSERT/DELETE split-merge tracking is unaffected.

Author: mason-sharp

internal/infra/cdc/listen.go

@@ -382,6 +382,12 @@ func processReplicationStream(ctx context.Context, nodeInfo map[string]any, cont
 			return fmt.Errorf("failed to mark all leaves dirty for truncated table %s.%s: %w", rel.Namespace, rel.RelationName, err)
 		}
 		purgeTableChanges(txChanges, rel.Namespace, rel.RelationName)
+		// All leaves are now dirty, which is the escalated state, so record it:
+		// later UPDATEs on a re-populated table skip per-PK tracking rather than
+		// re-running the threshold count and a redundant mark-all.
+		if esc != nil {
+			esc.markEscalated(rel.Namespace, rel.RelationName)
+		}
 		logger.Info("TRUNCATE decoded for %s.%s: marked all %d blocks dirty for rehash on next tree update", rel.Namespace, rel.RelationName, marked)
 		return nil
 	}