feat: 階段 6 工具四待辦事項（全域待辦、類型自訂、到點提醒、確認後執行並回報）

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

hooks/skilltool.ts

@@ -1,5 +1,6 @@
 import type { Engine } from 'claude-code'
 
+import { TODO_COMMAND } from './todo'
 import {
   GUIDE_SKILL, SKILL_DIR, SKILL_PREFIX, bumpVersion, commandOf, generatePrompt, guideSkillMd, parseArgs,
   parseEntries, parseGenerated, renderGuide, setPluginVersion, setReadmeVersion, upsertEntry, validateSkill,
@@ -10,6 +11,7 @@ export const NEED_ACTIVE = '請先啟動角色（/jsc-anima:{作品代號}-{角
 
 export async function registerTools($: Engine): Promise<void> {
   await $.command.register({ name: TOOL_COMMAND, description: '依描述產生助理技能並建立 PR：<技能名稱> <描述>' })
+  await $.command.register({ name: TODO_COMMAND, description: '待辦事項：add／update／list／type／run／done' })
 }
 
 const MODEL = 'sonnet'