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.test.ts

@@ -6,14 +6,14 @@ import { buildInjection } from './inject'
 import type { IndexEntry } from './retrieval'
 
 const entry = (id: string, fn: IndexEntry['function']): IndexEntry => ({ id, function: fn, emotion: 'neutral', mode: null, text: `句${id}` })
-const indexes = {
+const indexes: Record<string, IndexEntry[]> = {
   'sao-asuna': [entry('a', 'comfort'), entry('b', 'comfort')],
-  'sao-suguha': [] as IndexEntry[],
+  'sao-suguha': [],
 }
 const answer = (text: string): Complete => async () => ({ isAnswered: true, text })
 const deps = (opts: Record<string, string>, complete: Complete, calls = { n: 0 }) => ({
   config: resolveConfig(opts),
-  indexes,
+  loadIndex: async (c: string) => indexes[c] ?? [],
   complete: async (r: Parameters<Complete>[0]) => (calls.n++, complete(r)),
   now: () => 0,
   turn: 0,