refactor(create-tools): keep result type internal

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/create-tools.ts

@@ -9,7 +9,7 @@ import { createAvailableCategories } from "./plugin/available-categories"
 import { createSkillContext } from "./plugin/skill-context"
 import { createToolRegistry } from "./plugin/tool-registry"
 
-export type CreateToolsResult = {
+type CreateToolsResult = {
   filteredTools: ToolsRecord
   mergedSkills: LoadedSkill[]
   availableSkills: AvailableSkill[]