feat(plugin): integrate skill_mcp tool with session-scoped lifecycle management

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/tools/index.ts

@@ -31,6 +31,7 @@ import {
 export { interactive_bash, startBackgroundCheck as startTmuxCheck } from "./interactive-bash"
 export { createSkillTool } from "./skill"
 export { getTmuxPath } from "./interactive-bash/utils"
+export { createSkillMcpTool } from "./skill-mcp"
 
 import {
   createBackgroundTask,