feat: 亞絲娜與直葉的角色包 (#6, #7)

build_pack.py 產生對白索引（放在使用者資料目錄）；render_skill.py 把人格卡渲染成
角色 skill 並檢查精選對白逐字來自索引；插件改成執行期從資料目錄讀索引。

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

plugins/anime-companion/hooks/inject.ts

@@ -6,7 +6,7 @@ import { retrieve, type IndexEntry } from './retrieval'
 
 export type InjectDeps = {
   config: Config
-  indexes: Readonly<Record<CharacterCode, readonly IndexEntry[]>>
+  loadIndex: (character: CharacterCode) => Promise<readonly IndexEntry[]>
   complete: Complete
   append: (text: string) => Promise<unknown>
   now: () => number
@@ -16,12 +16,12 @@ export type InjectDeps = {
 // 回傳 null 表示這一輪不注入（沒選角色、強度 0、索引為空、分類失敗或沒有同標籤的對白）。
 // 索引為空時不呼叫模型，省下一次無用的分類。
 export async function buildInjection(
-  { config, indexes, complete, now, turn }: Omit<InjectDeps, 'append'>,
+  { config, loadIndex, complete, now, turn }: Omit<InjectDeps, 'append'>,
   userText: string,
 ): Promise<{ text: string | null; fn: string | null; ms: number } | null> {
   const character = config.character
   if (character === null || config.intensity === 0) return null
-  const index = indexes[character]
+  const index = await loadIndex(character)
   if (index.length === 0) return null
   const started = now()
   const fn = await classify(complete, userText)