fix: v0.6.1 生产可用性深度审查 — MemoryEngine 级联环无限递归（P0）/ KVStore 多表事务与级联原子化 / 未open防护统一 / 27 个异常场景测试 + aria级联回归

src/engine/memory.ts

@@ -489,9 +489,18 @@ export class MemoryEngine implements IStorageEngine {
 
   /**
    * 级联删除：查找引用 tableName.pkValue 的所有表的行并删除。
+   * v0.6.1-fix: 环路保护（A→B→A 级联环不再无限递归栈溢出，AriaEngine 同语义）。
    * @returns 级联删除的行数
    */
-  private async cascadeDelete(tableName: string, pkValue: string, _row: Record<string, unknown>): Promise<number> {
+  private async cascadeDelete(
+    tableName: string,
+    pkValue: string,
+    _row: Record<string, unknown>,
+    visited: Set<string> = new Set(),
+  ): Promise<number> {
+    const visitKey = `${tableName}:${pkValue}`;
+    if (visited.has(visitKey)) return 0;
+    visited.add(visitKey);
     let totalCascade = 0;
 
     for (const [refTableName, refSchema] of this.schemas) {
@@ -529,7 +538,7 @@ export class MemoryEngine implements IStorageEngine {
             if (refRow) {
               // v0.3.3: 级联删除前清理索引条目
               this.removeIndexEntries(refTableName, refRow, refPk);
-              totalCascade += await this.cascadeDelete(refTableName, refPk, refRow);
+              totalCascade += await this.cascadeDelete(refTableName, refPk, refRow, visited);
             }
             refTableData.delete(refPk);
             totalCascade++;