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/register.tsx

@@ -1,15 +1,21 @@
 import type { Register } from 'claude-code'
 
+import type { CharacterCode } from './characters'
 import { resolveConfig } from './config'
-import { INDEXES } from './data/index'
+import { indexPath, loadIndex } from './index-loader'
 import { buildInjection } from './inject'
+import type { IndexEntry } from './retrieval'
 import { buildRules, SECTION_ID } from './rules'
 
 // 規則段落（W8）加到系統提示最後；每則使用者訊息再依功能標籤檢索角色的對白當語氣參考（W7）。
+// 對白索引在使用者資料目錄（dataDir，預設 ~/.claude/anime-companion/<角色>/index.jsonl）。
 export const register: Register = (on, options) => {
   const config = resolveConfig(options)
   const showTiming = options.showTiming === true
+  const dataDir = typeof options.dataDir === 'string' ? options.dataDir : ''
   let turn = 0
+  // 只快取讀到內容的索引；沒讀到（還沒建置）下一輪會再試，建置完不必重開 session。
+  const cache = new Map<CharacterCode, readonly IndexEntry[]>()
 
   on('prompt.compose', async ($, e, next) => {
     const result = await next(e)
@@ -20,8 +26,16 @@ export const register: Register = (on, options) => {
 
   on('prompt.submit', async ($, e, next) => {
     if (e.command || e.isMeta) return next(e)
+    const load = async (code: CharacterCode) => {
+      const hit = cache.get(code)
+      if (hit) return hit
+      const path = indexPath(dataDir, await $.env.get('HOME'), code)
+      const index = await loadIndex(p => $.fs.read(p), path)
+      if (index.length > 0) cache.set(code, index)
+      return index
+    }
     const r = await buildInjection(
-      { config, indexes: INDEXES, complete: req => $.model.complete(req), now: Date.now, turn: turn++ },
+      { config, loadIndex: load, complete: req => $.model.complete(req), now: Date.now, turn: turn++ },
       e.text,
     )
     if (r === null) return next(e)