fix(rectification): ask reverse-inference probes at engine dasha months

Keep Vimshottari/Narayana start dates instead of truncating to year, so
same-year month splits can appear on the choice card.

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

frontend/tests/rectification-eight-method.test.ts

@@ -358,6 +358,30 @@ test("dasha conflict probe jumps after four scoreable events leave three trainin
   }), "collect_evidence");
 });
 
+test("dasha conflict probe keeps the engine month on the choice card", () => {
+  const plan = buildMethodFollowupPlan({
+    evidence: [
+      datedEvidence("education", "2016"),
+      datedEvidence("education", "2020"),
+      datedEvidence("relationship", "2018"),
+      datedEvidence("family", "2023"),
+    ],
+    eventProbes: [{
+      ...CAREER_CONFLICT_PROBE,
+      month: 3,
+      year_label: "2018 年 3 月前后",
+      source: "dasha_boundary",
+      user_meaning: "时间范围锁定 2018 年 3 月前后；领域锁定 career。",
+      semantic_key: "career.2018.03.dasha_boundary",
+    }],
+  });
+  assert.equal(plan.next_followup?.source, "event_probe");
+  assert.equal(plan.next_followup?.choice_frame?.period, "2018 年 3 月前后");
+  assert.equal(plan.next_followup?.year_label, "2018 年 3 月前后");
+  assert.equal(plan.next_followup?.probe_month, 3);
+  assert.match(plan.next_followup?.user_prompt_hint ?? "", /2018 年 3 月前后/);
+});
+
 test("three scoreable events in one domain still rotate methods instead of reverse-inferring", () => {
   const plan = buildMethodFollowupPlan({
     evidence: [