feat: 背景工作線（work 分類、子代理派工、完成後由角色回報）

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

hooks/router.ts

@@ -1,15 +1,15 @@
 export type ModelName = 'haiku' | 'sonnet' | 'opus'
 export type Effort = 'low' | 'medium' | 'high'
 export type Tone = 'neutral' | 'praise' | 'scold'
-export type Route = { difficulty: number; model: ModelName; effort: Effort; tone: Tone; ack: string }
+export type Route = { difficulty: number; model: ModelName; effort: Effort; tone: Tone; ack: string; work: boolean }
 
 export const LADDER: readonly ModelName[] = ['haiku', 'sonnet', 'opus']
 
-export const FALLBACK_ROUTE: Route = { difficulty: 5, model: 'sonnet', effort: 'medium', tone: 'neutral', ack: '' }
+export const FALLBACK_ROUTE: Route = { difficulty: 5, model: 'sonnet', effort: 'medium', tone: 'neutral', ack: '', work: false }
 
 export const CLASSIFY_PROMPT =
   '你是路由器。讀下面使用者輸入，只回傳一行 JSON：' +
-  '{"difficulty":1-10,"model":"haiku|sonnet|opus","effort":"low|medium|high","tone":"neutral|praise|scold","ack":"角色以口吻立刻回應的一句話"}。' +
+  '{"difficulty":1-10,"model":"haiku|sonnet|opus","effort":"low|medium|high","tone":"neutral|praise|scold","ack":"角色以口吻立刻回應的一句話","work":true|false}。work 為 true 表示需要動手做事（讀寫檔、執行指令、搜尋、改程式）；純閒聊或一句話可答的問題為 false。' +
   'difficulty 低用 haiku，中用 sonnet，高或需深入推理用 opus；tone 是使用者對角色的態度（誇獎／感謝為 praise，責罵為 scold）。\n\n使用者輸入：\n'
 
 const isModel = (v: unknown): v is ModelName => v === 'haiku' || v === 'sonnet' || v === 'opus'
@@ -27,6 +27,7 @@ export const parseRoute = (text: string): Route => {
       effort: isEffort(j.effort) ? j.effort : FALLBACK_ROUTE.effort,
       tone: isTone(j.tone) ? j.tone : 'neutral',
       ack: typeof j.ack === 'string' ? j.ack.slice(0, 200) : '',
+      work: j.work === true,
     }
   } catch {
     return FALLBACK_ROUTE