feat: companion 記憶權重、反覆思量與檢索

- 權重 W = I_eff × F × A，暫時／可升級／長期記憶的衰減與封存，任何記憶不刪除
- 未解負向事件反覆思量、開放迴路逾時、危險內容不固化
- 檢索改為關鍵字 + RRF × W + 心情一致加權，保留外部檢索器介面
- 版本 0.0.4

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

plugins/jsc-mod-companion/hooks/companion/companion.test.ts

@@ -362,6 +362,33 @@ describe('記憶、待辦與關心', () => {
     expect(await c.prompt()).toContain('payment')
   })
 
+  test('被罵的記憶是未解負向事件，道歉後解除；記憶不會被刪除', async () => {
+    const { c, fs } = setup()
+    await c.ensureActivated()
+    await c.onPrompt('你很煩，真的很煩人')
+    const path = `${ROOT}/companions/miko/memory.json`
+    const read = () => JSON.parse(fs.files.get(path)!) as { items: { negative?: boolean; resolvedAt?: number; status: string }[] }
+    expect(read().items[0]!.negative).toBe(true)
+    expect(read().items[0]!.resolvedAt).toBeUndefined()
+    await c.onPrompt('對不起，剛剛我太衝動了')
+    await c.onTurnComplete(false, '沒關係啦。<評估:apology>')
+    expect(read().items[0]!.resolvedAt !== undefined).toBe(true)
+    expect(read().items[0]!.status).toBe('active')
+  })
+
+  test('回覆中的提問成為開放迴路，2 回合沒回應就逾時', async () => {
+    const { c, fs } = setup()
+    await c.ensureActivated()
+    await c.onTurnComplete(false, '好喔。你今天吃飯了嗎？')
+    const path = `${ROOT}/companions/miko/memory.json`
+    const loops = () => (JSON.parse(fs.files.get(path)!) as { loops: { status: string }[] }).loops
+    expect(loops()[0]!.status).toBe('open')
+    await c.onPrompt('幫我看看建置')
+    expect(loops()[0]!.status).toBe('open')
+    await c.onPrompt('順便跑一下測試')
+    expect(loops()[0]!.status).toBe('timeout')
+  })
+
   test('太短的提示不寫入記憶', async () => {
     const { c, fs } = setup()
     await c.ensureActivated()