fix(rectification): keep same-sentence dated events after structured answers

The choice and collect fast paths applied the answer then returned,
so a dated event in the same utterance never reached the evidence
ledger. Idle persist also prechecked follow-up with a hardcoded
collect_evidence outcome instead of the dossier decision.

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

frontend/tests/rectification-turn-intent-classifier.test.ts

@@ -5,6 +5,8 @@ import test from "node:test";
 import {
   optionIdForAnswerClass,
   parseRectificationTurnIntent,
+  shouldContinueAgentForDatedEvent,
+  shouldDeclineCollectFocus,
 } from "../src/lib/rectification-agentic/v9/turn-intent-classifier.ts";
 import type { ConversationFocus } from "../src/lib/rectification-agentic/v9/tool-service.ts";
 import { CASE_ID, FOCUS_ID } from "./rectification-v9-test-support.ts";
@@ -71,6 +73,36 @@ test("turn intent parser enforces answer_class only for current-focus answers",
   }), null);
 });
 
+test("missing has_new_dated_event is treated as false and true is fail-closed optional", () => {
+  const legacy = parseRectificationTurnIntent({
+    intent: "answer_current_focus",
+    answer_class: "no",
+  });
+  assert.equal(legacy?.intent, "answer_current_focus");
+  assert.equal(legacy?.answer_class, "no");
+  assert.equal(legacy?.has_new_dated_event, undefined);
+  assert.equal(shouldContinueAgentForDatedEvent(legacy), false);
+  assert.equal(shouldContinueAgentForDatedEvent(null), false);
+  assert.equal(shouldContinueAgentForDatedEvent({
+    intent: "answer_current_focus",
+    answer_class: "no",
+    has_new_dated_event: false,
+  }), false);
+  const withEvent = parseRectificationTurnIntent({
+    intent: "answer_current_focus",
+    answer_class: "no",
+    has_new_dated_event: true,
+  });
+  assert.equal(withEvent?.has_new_dated_event, true);
+  assert.equal(shouldContinueAgentForDatedEvent(withEvent), true);
+  assert.equal(shouldDeclineCollectFocus(withEvent), true);
+  assert.equal(parseRectificationTurnIntent({
+    intent: "answer_current_focus",
+    answer_class: "no",
+    has_new_dated_event: "yes",
+  }), null);
+});
+
 test("answer classes resolve through each dynamic option instead of A/B/C/D position", () => {
   const focus = focusWithOptions(SHUFFLED_CHOICE);
   assert.equal(optionIdForAnswerClass(focus, "no"), "A");