Track subcall read regions within read-only calls

crates/objects/tests/README.md

@@ -8,3 +8,5 @@
 | [store.rs](store.rs) | 只读嵌套、容器与类型写入屏障、稳定地址、跨存储句柄拒绝与更新原子性、Dict／Cell 循环回收、函数校验失败无泄漏、共享代码与常量生命周期 |
 
 非法句柄索引、槽位代数与计数溢出仍在 src/heap.rs 的私有单元测试内，不开放句柄构造器。VM 委托 API 与求值行为继续由 [core/tests](../../core/tests/README.md) 检查。随工作区在指定远端运行，本地不测试；现有测试源码不代表已通过，见 [验证](../../../docs/operations/validation.md)。返回 [objects](../README.md)。
+
+store.rs 还覆盖只读子调用读取区域、重复读取、LIFO 校验与未关闭区域的调用结束清理；这些用例按约定不在本地运行。

crates/objects/tests/store.rs

@@ -153,3 +153,33 @@ fn read_only_scopes_block_existing_container_and_type_writes_but_allow_fresh_res
     store.collect_cycles();
     assert_eq!(store.object_count(), 0);
 }
+
+#[test]
+fn read_tracking_regions_repeat_shared_reads_and_preserve_enclosing_dependencies() {
+    let mut store = ObjectStore::new().unwrap();
+    let first = store.new_object().unwrap();
+    let second = store.new_object().unwrap();
+    assert!(store.begin_read_tracking().is_err());
+    let scope = store.begin_read_only();
+    let outer = store.begin_read_tracking().unwrap();
+    store.object(first).unwrap();
+    let nested = store.begin_read_tracking().unwrap();
+    store.object(first).unwrap();
+    store.object(second).unwrap();
+    assert!(store.end_read_tracking(outer).is_err());
+    assert_eq!(
+        store.end_read_tracking(nested).unwrap(),
+        vec![first, second]
+    );
+    assert_eq!(store.end_read_tracking(outer).unwrap(), vec![first, second]);
+    let repeated = store.begin_read_tracking().unwrap();
+    store.object(first).unwrap();
+    assert_eq!(store.end_read_tracking(repeated).unwrap(), vec![first]);
+    // Ending the call discards an unfinished region, as on callback failure.
+    store.begin_read_tracking().unwrap();
+    assert_eq!(store.end_read_only(scope).unwrap(), vec![first, second]);
+    assert!(store.end_read_tracking(1).is_err());
+    assert!(!store.is_read_only());
+    store.release(first).unwrap();
+    store.release(second).unwrap();
+}