feat: M2 — 写→审(一致性)→裁决→验收(事务)；未决冲突禁验收

- 续审 Agent 声明(AgentSpec) + 结构化输出契约(ContinuityReview/Conflict 五类)
- LangGraph 并行审子图(可扩四审) + collect 落 chapter_reviews 留痕 + review SSE(section/conflict)
- 验收-side Repository：章节 accepted 版本晋升 + digest append-only + 审稿留痕/裁决
- API：review(SSE) + reviews 历史 + accept(单原子事务：晋升 version + 终稿 digest + 裁决留痕)
- 冲突 gate：未决裁决拦截(CONFLICT_UNRESOLVED)；digest 从终稿提炼(不变量#4)
- 前端：审稿报告页 + 冲突就地标注 + 裁决(采纳/忽略/手改) + 未决禁验收 + 「本次将更新」清单
- M2 E2E：真实 DB + 多档位 mock 网关零 token 走通 写→审→裁决→验收→摘要入库
- 多 agent 协同台账(PROGRESS.md) + 共享记忆(memory/contracts·decisions·gotchas)

apps/web/lib/review/useAccept.ts

@@ -0,0 +1,76 @@
+"use client";
+
+import { useCallback, useState } from "react";
+
+import { api } from "@/lib/api/client";
+import { useToast } from "@/components/Toast";
+import type { AcceptResponse } from "@/lib/api/types";
+import { buildAcceptRequest, type DecisionDraft } from "./decisions";
+
+export type AcceptStatus = "idle" | "accepting" | "accepted" | "error";
+
+export interface AcceptOutcome {
+  result: AcceptResponse | null;
+  // 409 CONFLICT_UNRESOLVED 缺判下标（高亮报告卡）。
+  missingIndices: number[];
+}
+
+export interface UseAccept {
+  status: AcceptStatus;
+  result: AcceptResponse | null;
+  accept: (
+    projectId: string,
+    chapterNo: number,
+    finalText: string,
+    drafts: readonly DecisionDraft[],
+  ) => Promise<AcceptOutcome>;
+}
+
+interface ApiErrorEnvelope {
+  error?: {
+    code?: string;
+    message?: string;
+    details?: { missing_conflict_indices?: number[] } | null;
+  };
+}
+
+// 验收：乐观置 accepting → 成功置 accepted（呈现「本次将更新」清单）；
+// 失败回滚状态 + toast；409 CONFLICT_UNRESOLVED 解析缺判下标供高亮。
+export function useAccept(): UseAccept {
+  const [status, setStatus] = useState<AcceptStatus>("idle");
+  const [result, setResult] = useState<AcceptResponse | null>(null);
+  const toast = useToast();
+
+  const accept = useCallback<UseAccept["accept"]>(
+    async (projectId, chapterNo, finalText, drafts) => {
+      setStatus("accepting");
+      const body = buildAcceptRequest(finalText, drafts);
+      const { data, error } = await api.POST(
+        "/projects/{project_id}/chapters/{chapter_no}/accept",
+        {
+          params: { path: { project_id: projectId, chapter_no: chapterNo } },
+          body,
+        },
+      );
+      if (error || !data) {
+        setStatus("error");
+        const env = error as ApiErrorEnvelope | undefined;
+        const code = env?.error?.code;
+        const missing = env?.error?.details?.missing_conflict_indices ?? [];
+        if (code === "CONFLICT_UNRESOLVED") {
+          toast("尚有冲突未裁决，请先处理高亮项", "error");
+          return { result: null, missingIndices: missing };
+        }
+        toast("验收失败，请重试（正文未丢失）", "error");
+        return { result: null, missingIndices: [] };
+      }
+      setResult(data);
+      setStatus("accepted");
+      toast("本章已验收", "success");
+      return { result: data, missingIndices: [] };
+    },
+    [toast],
+  );
+
+  return { status, result, accept };
+}