fix(memhub): __init__ 显式初始化 detection 字段防默认值失效 - TPC 类字段默认值对 CDefine 常量可能不生效，detection_size=垃圾 → malloc(垃圾) 1-byte 记录区 → 扩容 realloc double-free(ASAN 捕获)；显式赋值 detection_size/MEMBUDDY_DET_RECORD_SIZE + _det_arena/_det_records/_det_count/_det_cap

includes/memhub.vp

@@ -333,6 +333,14 @@ class MemBuddy(MemManager):
         self.base = base
         self.size = size
         self.detection = detection
+        # 显式赋值（不能依赖字段默认值——TPC 类字段默认值对 CDefine 常量
+        # 可能不生效，垃圾 detection_size → malloc(垃圾) 1-byte 记录区 →
+        # 扩容 realloc double-free，ASAN 已捕获）
+        self.detection_size = MEMBUDDY_DET_RECORD_SIZE
+        self._det_arena = None
+        self._det_records = None
+        self._det_count = 0
+        self._det_cap = 0
         self.max_order = 0
         self.free_lists = None
         self.lock_val = 0