v0.2.18

What's Changed

• cleanup: 删 kvspaceDisconnect + Char xvalue 构造/访问器 + shm delextindex by @miaobyte in #27
• ci: 增加 macOS 构建 by @miaobyte in #29
• release: 纳入权威 ABI 头 by @miaobyte in #30
• release: 打包改递归收集（头/库自动发现） by @miaobyte in #31
• header-only：blockmalloc / slotsboxmalloc 走单头文件模式 by @miaobyte in #32

Full Changelog: v0.2.16...v0.2.18