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指针隐式转换收紧后，结构体分支只认 isDerivedFrom(src, dest) 的**上转型**，
把下转型判为非法，导致 TransPyV 真实代码误报：
TransPyV/App/lib/core/Gen/Call/CallGenDispatch.vp:824
len_arg_node: ast.AST* = cargs.get(0)
self.Gen.CallGenProp._is_list_builtin_receiver(pool, len_val, len_cls_nm,
"__len__", len_arg_node)
形参声明 cl: rawptr[ast.Call]（Call 派生自 AST）
→ 无法将"rawptr[AST]"类型的参数分配给函数"_is_list_builtin_receiver"中
类型为"rawptr[Call]"的参数"cl"
Viper 指针运行期不带静态类型（都是 i8*），同一继承体系内的 reinterpret
（含下转型）是既有代码的常规写法，编译器也接受，故改为**继承体系内双向**：
isDerivedFrom(src, dest) || isDerivedFrom(dest, src)（仍在 cloneAsInstantiable
之后比较）。不相关结构体（Node* → Other*）、结构体 ↔ 基本类型仍拒绝。
viperPointerConversion.test.ts 增至 3 用例：新增「AST*↔Call* 放行 + 不相关结构体
报 L28」，既有 2 用例断言（[19] / [36,46,49]）不变。jest 822 → 823。