fix(rectification): dedupe post-adopt verify and skip this probe only

Adopted reverse-verify repeated already-asked collect stems, treated 「这题跳过」 as stopping the case, and promised holdout/OOS checks that never ran. Collect spoken stems no longer prefix a year.

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

frontend/src/lib/rectification-surface-state.ts

@@ -55,6 +55,7 @@ export type RectificationCaseSnapshotPayload = Readonly<{
   current_question?: unknown;
   choice_card?: unknown;
   question_source?: unknown;
+  next_user_action?: Readonly<{ id?: unknown }>;
   case?: Readonly<{
     status?: unknown;
     accepted_time?: unknown;
@@ -219,7 +220,7 @@ export function rectificationConversationState(input: Readonly<{
   return "empty";
 }
 
-export type RectificationQuestionGapState = "idle" | "preparing" | "unavailable";
+export type RectificationQuestionGapState = "idle" | "preparing" | "unavailable" | "verified_idle";
 
 export type RectificationQuestionGapInput = Readonly<{
   /** The current question is rendered live inside an assistant message. */
@@ -230,6 +231,8 @@ export type RectificationQuestionGapInput = Readonly<{
   questionLoadFailed: boolean;
   /** Candidate cards are offered and not yet adopted: the reader, not the server, holds the next move. */
   offerAwaitingReader?: boolean;
+  /** GET / structured-choice `next_user_action.id`; `start_consultation` means post-adopt verify is done. */
+  nextUserActionId?: string | null;
   busy: boolean;
   readonly: boolean;
   regenerating: boolean;
@@ -254,6 +257,7 @@ export function rectificationQuestionGapState(input: RectificationQuestionGapInp
   if (!input.snapshotLoaded) return retryGate;
   if (!input.resumableCase) return "idle";
   if (input.liveQuestionVisible || input.offerAwaitingReader) return "idle";
+  if (input.nextUserActionId === "start_consultation") return "verified_idle";
   if (input.questionLoadFailed) return "unavailable";
   // Either the snapshot names no question, or it names one that no settled
   // message carries live yet: both are a gap the next read may close.