feat: companion 核心的人設注入、語氣、心情標記與互動記憶

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

plugins/cockpit/companion/inject.ts

@@ -0,0 +1,40 @@
+import { redactSecrets } from './secrets.ts'
+
+export const BUDGET = { card: 400, mood: 100, memory: 800, care: 200 } as const
+export type Section = keyof typeof BUDGET
+
+/** 粗估 token：CJK 一字約一 token，其餘約四字元一 token */
+export function estimateTokens(text: string): number {
+  let cjk = 0
+  for (const ch of text) if (/[⺀-鿿＀-￯　-〿]/.test(ch)) cjk++
+  return cjk + Math.ceil((text.length - cjk) / 4)
+}
+
+export type Item = { text: string; score: number }
+
+/** 在預算內保留高分項目，維持原順序；超出時先丟低分 */
+export function fitBudget(items: Item[], budget: number): string[] {
+  const kept = new Set(items.map((_, i) => i))
+  const order = items.map((it, i) => ({ i, score: it.score })).sort((a, b) => a.score - b.score || b.i - a.i)
+  let total = items.reduce((n, it) => n + estimateTokens(it.text), 0)
+  for (const { i } of order) {
+    if (total <= budget) break
+    total -= estimateTokens(items[i]!.text)
+    kept.delete(i)
+  }
+  return items.filter((_, i) => kept.has(i)).map(it => it.text)
+}
+
+export type Sections = Record<Section, Item[]>
+
+/** 穩定內容（角色卡）在前，變動內容（心情、記憶、關心情境）在後 */
+export function assemble(s: Sections): string {
+  const part = (title: string, key: Section) => {
+    const lines = fitBudget(s[key], BUDGET[key]).map(redactSecrets)
+    return lines.length ? `## ${title}\n${lines.join('\n')}` : ''
+  }
+  const body = [part('角色', 'card'), part('互動記憶', 'memory'), part('目前心情', 'mood'), part('關心情境', 'care')]
+    .filter(Boolean)
+    .join('\n\n')
+  return body ? `<companion>\n${body}\n</companion>` : ''
+}