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/history.test.ts

@@ -0,0 +1,54 @@
+import { describe, expect, it } from "vitest";
+
+import type { ReviewHistoryItem } from "@/lib/api/types";
+import { latestReview, normalizeConflicts } from "./history";
+
+const item = (
+  conflicts: Record<string, unknown>[],
+): ReviewHistoryItem => ({
+  id: "00000000-0000-0000-0000-000000000001",
+  project_id: "00000000-0000-0000-0000-000000000002",
+  chapter_no: 128,
+  conflicts,
+});
+
+describe("normalizeConflicts", () => {
+  it("tightens loose dicts into ReviewConflict, preserving order", () => {
+    const out = normalizeConflicts(
+      item([
+        {
+          type: "设定违例",
+          where: "第4段",
+          refs: ["第30章"],
+          suggestion: "统一血脉",
+        },
+        { type: "时间线倒错", where: "第8段", refs: [], suggestion: "调整" },
+      ]),
+    );
+    expect(out).toEqual([
+      { type: "设定违例", where: "第4段", refs: ["第30章"], suggestion: "统一血脉" },
+      { type: "时间线倒错", where: "第8段", refs: [], suggestion: "调整" },
+    ]);
+  });
+
+  it("fills safe defaults for missing/wrong-typed fields", () => {
+    const out = normalizeConflicts(item([{ where: 42, refs: "x" }]));
+    expect(out).toEqual([
+      { type: "未分类", where: "", refs: [], suggestion: "" },
+    ]);
+  });
+
+  it("returns [] for undefined item or missing conflicts", () => {
+    expect(normalizeConflicts(undefined)).toEqual([]);
+  });
+});
+
+describe("latestReview", () => {
+  it("returns first item (history is newest-first)", () => {
+    const a = item([]);
+    const b = item([]);
+    expect(latestReview([a, b])).toBe(a);
+    expect(latestReview([])).toBeUndefined();
+    expect(latestReview(undefined)).toBeUndefined();
+  });
+});