记忆功能受环境变量开关控制：VT_MEMORY_QUALITY、VT_MEMORY_GC、VT_MEMORY_DECAY、VT_MEMORY_COMPRESSION、VT_MEMORY_FTS_INDEX_ENABLED、VT_MEMORY_LINKS_ENABLED、VT_MEMORY_HIERARCHY_ENABLED；默认持久化目录为 ~/.vibe-trading/memory。