feat(web): hang Agent-authored A/B/C/D cards under rectification replies

Conflict nodes stay server-owned; the Agent writes the question and option copy so users can tap instead of typing through an interrogation.

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

frontend/src/app/api/rectification/cases/[caseId]/route.ts

@@ -10,6 +10,7 @@ import {
   RectificationToolServiceError,
   type V9CaseDossier,
 } from "@/lib/rectification-agentic/v9/tool-service";
+import { choiceCardFromCaseDossier } from "@/lib/rectification-agentic/v9/interview-state";
 
 export const runtime = "nodejs";
 
@@ -107,6 +108,7 @@ function dossierResponse(
     })),
     evidence: dossier.evidence,
     latest_result: dossier.latestResult,
+    choice_card: choiceCardFromCaseDossier(dossier),
   };
 }