refactor(frontend): clarify toVM/PROCEED 提取到 clarify.ts 共享（WFW-9 M2）

apps/web/lib/workbench/clarify.ts

@@ -62,3 +62,33 @@ export function foldClarifications(
 export function needsClarifyGate(instruction: string, minChars: number): boolean {
   return instruction.trim().length < minChars;
 }
+
+// 澄清预检结论为「放行」（直接去 refine/rewrite，不反问）——后端 error/前端异常时的确定性回退。
+export const PROCEED: ClarifyDecisionVM = { needClarification: false, questions: [] };
+
+// 后端 snake_case ClarifyDecision 的原始形状（外部数据，全部可选——不信任、显式取值 + 默认）。
+export interface ClarifyDecisionRaw {
+  need_clarification?: boolean;
+  questions?: {
+    question?: string;
+    options?: { label?: string; value?: string }[];
+    allow_free_text?: boolean;
+  }[];
+  verification?: string | null;
+}
+
+// 后端 snake_case ClarifyDecision → 前端 camelCase VM（纯映射，refine/rewrite 两侧预检共用）。
+export function toVM(data: ClarifyDecisionRaw): ClarifyDecisionVM {
+  return {
+    needClarification: Boolean(data.need_clarification),
+    questions: (data.questions ?? []).map((q) => ({
+      question: q.question ?? "",
+      options: (q.options ?? []).map((o) => ({
+        label: o.label ?? "",
+        value: o.value ?? "",
+      })),
+      allowFreeText: Boolean(q.allow_free_text),
+    })),
+    verification: data.verification ?? undefined,
+  };
+}