docs: add mcpplibs-capi-lua agent skill

- SKILL.md: quick start, naming map, core API cheat sheet, common patterns,
  build config, caveats (callback signatures, extern C, inline limitation)
- reference.md: complete API reference with all 15 types, 50+ constants,
  100+ functions organized by category with C API correspondence
- Update skills README to list both available skills

Co-authored-by: SPeak <sunrisepeak@d2learn.org>

Author: cursoragent

.agents/skills/README.md

@@ -1,12 +1,13 @@
-# mcpp-style-ref Agent Skills
+# mcpplibs Agent Skills
 
-用于指导 Agent 在编写或审查 Modern/Module C++ 代码时遵循 mcpp-style-ref 规范的技能。
+用于指导 Agent 在 mcpplibs 生态中开发的技能集合。
 
 ## 可用技能
 
 | 技能 | 说明 |
 |------|------|
 | [mcpp-style-ref](mcpp-style-ref/SKILL.md) | 面向 mcpp 项目的 Modern/Module C++ (C++23) 命名、模块化与实践规则 |
+| [mcpplibs-capi-lua](mcpplibs-capi-lua/SKILL.md) | Lua C API 的 C++23 模块化绑定 — 类型映射、API 速查、常见模式与构建配置 |
 
 ## 使用方式
 
@@ -15,10 +16,12 @@
 ```bash
 mkdir -p .cursor/skills
 ln -s ../../skills/mcpp-style-ref .cursor/skills/mcpp-style-ref
+ln -s ../../skills/mcpplibs-capi-lua .cursor/skills/mcpplibs-capi-lua
 ```
 
 或安装为个人技能：
 
 ```bash
-ln -s /path/to/mcpp-style-ref/skills/mcpp-style-ref ~/.cursor/skills/mcpp-style-ref
+ln -s /path/to/skills/mcpp-style-ref ~/.cursor/skills/mcpp-style-ref
+ln -s /path/to/skills/mcpplibs-capi-lua ~/.cursor/skills/mcpplibs-capi-lua
 ```