fix(rectification): stop discriminator followup from dropping user evidence

Decision and question ranking now share contrast option completion, so a
missing style card cannot deadlock the interview with a dead-end reply.

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

frontend/src/app/api/rectification/agent/route.ts

@@ -36,6 +36,8 @@ import { buildMethodFollowupPlan } from "@/lib/rectification-agentic/v9/method-f
 export const runtime = "nodejs";
 export const maxDuration = 240;
 
+export const DISCRIMINATOR_EXHAUSTED_NARRATION = "当前几个候选已经构成可信区间。你可以再说一件记得住时间的经历，也可以先按这个区间看盘。";
+
 function completedMessageResponse(text: string, requestId: string, caseId: string) {
   const body = [
     JSON.stringify({ type: "answer.delta", text }),
@@ -414,7 +416,7 @@ export async function POST(request: Request) {
             followup: plan.next_followup,
           });
           const open = openQuestionFromPersistedFocus(persisted);
-          if (open && persisted.focus) {
+          if (open && persisted.focus && open.unrenderable !== true) {
             let classified = null;
             try {
               classified = await classifyRectificationTurnIntent(selectedModel, {
@@ -456,13 +458,14 @@ export async function POST(request: Request) {
             });
             return completedMessageResponse(narration, requestId, caseId);
           }
-          const narration = "目前没有可继续区分的问题。当前几个候选构成可信区间，不再泛问已经覆盖过的经历。";
-          await persistV9DeterministicTurn(accounting, userId, caseId, {
-            requestId,
-            userMessage: parsed.data.message ?? null,
-            assistantMessage: narration,
-          });
-          return completedMessageResponse(narration, requestId, caseId);
+          if (!plan.next_followup) {
+            await persistV9DeterministicTurn(accounting, userId, caseId, {
+              requestId,
+              userMessage: parsed.data.message ?? null,
+              assistantMessage: DISCRIMINATOR_EXHAUSTED_NARRATION,
+            });
+            return completedMessageResponse(DISCRIMINATOR_EXHAUSTED_NARRATION, requestId, caseId);
+          }
         }
       }
     } catch (error) {