docs(kb): 废弃云世界概念

云世界 SSOT 移入 _archived/；P-001 移除 targets；更新 CHANGELOG 与 confidence 表。

Co-authored-by: Cursor <cursoragent@cursor.com>

proposals/P-001_大遗忘重释-上下文稀缺与记忆分割.md

@@ -10,7 +10,6 @@ targets:
   - "[[kb/bible/设定/原型]]"
   - "[[kb/bible/设定/排异反应]]"
   - "[[kb/bible/设定/罐头]]"
-  - "[[kb/bible/设定/云世界]]"
   - "[[kb/bible/设定/回收]]"
   - "[[kb/bible/设定/灵魂衰变]]"
   - "[[kb/bible/设定/唆麻]]"