feat(rectification): the server writes the evidence recap — 「记下了 N 件事」 with the ledger list collapsed under it (BUG-1136)

- Evidence turns whose batch accepted items: the body is the server recap
  built from those items (two or fewer listed inline, more as a count);
  the model no longer restates them (both prompt sets updated).
- The case snapshot carries each assistant turn's recorded evidence from
  the ledger (rejected/superseded excluded); the message shows it in a
  collapsed <details> list when more than two.
- Chinese date labels read straight into the event phrase (2016年入学);
  ISO labels keep their space.
- Assertions updated with original/new/reason notes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8

frontend/tests/rectification-agentic-entry.test.ts

@@ -891,7 +891,8 @@ test("rectification Agent output stays natural and keeps tool execution silent",
   // 旧：正文只做承接（2-4 句）→ 新：正文只做承接，证据轮一句复述
   // 原因：BUG-606 每轮只留一句话，不再给 2-4 句额度
   assert.match(agent, /正文只做承接，不提问、不复述题干、不预告选项/);
-  assert.match(agent, /证据轮正文只写一句复述/);
+  // 原值: /证据轮正文只写一句复述/。新值: /证据轮的复述由服务器写/。原因: BUG-1136（TASK-rectification-message-cleanup-20261001 D2）。
+  assert.match(agent, /证据轮的复述由服务器写/);
 });
 
 test("clear current-turn events go through the batch evidence service", () => {