feat: M3 — 伏笔账本 + 节奏引擎 + 大纲（含并发记账 bugfix）

- 伏笔账本：纯函数状态机(OPEN/PARTIAL/CLOSED/OVERDUE) + ForeshadowLedger repo；验收后到期扫描(BackgroundTask 自建 session 置 OVERDUE)；登记/状态变更端点
- 节奏 + 三审齐：foreshadow-analyst + pace-checker 并入 LangGraph 并行审(REVIEW_SPECS)，collect 分列落 chapter_reviews(conflicts/foreshadow_sug/pace)，review SSE 加 foreshadow/pace 事件
- 大纲：outliner Agent 产 OutlineResult(含 foreshadow_windows)，POST /outline 逐章 upsert outline 表；GET /foreshadow?status= 看板
- 前端：伏笔四泳道看板(OVERDUE 琥珀) + 大纲编辑器(窗口徽标) + 节奏节拍图(▁▃▅) + 审稿页消费 foreshadow/pace SSE
- bugfix(T3.8)：并行三审共用请求 session 记账触发 'Session is already flushing' → foreshadow/pace 静默丢失；SqlAlchemyLedgerSink.record 改 add-only(靠端点/事务 commit)，加并发回归测试
- M3 E2E：真实 DB + mock 网关零 token 走通 埋设→进展→验收后扫描 OVERDUE→看板 + 大纲含窗口 + 三审齐 SSE/留痕；E2E 暴露并钉住上述 bug
- 门禁绿：mypy 111 / pytest 228(0 xfailed) / alembic 无漂移；前端 gen:api/lint/tsc/vitest 69/build

apps/web/lib/review/history.test.ts

@@ -1,7 +1,12 @@
 import { describe, expect, it } from "vitest";
 
 import type { ReviewHistoryItem } from "@/lib/api/types";
-import { latestReview, normalizeConflicts } from "./history";
+import {
+  latestReview,
+  normalizeConflicts,
+  normalizeForeshadowSug,
+  normalizePace,
+} from "./history";
 
 const item = (
   conflicts: Record<string, unknown>[],
@@ -43,6 +48,56 @@ describe("normalizeConflicts", () => {
   });
 });
 
+describe("normalizeForeshadowSug", () => {
+  it("tightens flat list with kind, defaulting kind to planted", () => {
+    const out = normalizeForeshadowSug({
+      ...item([]),
+      foreshadow_sug: [
+        { kind: "resolved", code: "F-012", title: "神秘玉佩", where: "第4段" },
+        { title: "残破地图" },
+      ],
+    });
+    expect(out).toEqual([
+      {
+        kind: "resolved",
+        code: "F-012",
+        title: "神秘玉佩",
+        where: "第4段",
+        note: null,
+      },
+      { kind: "planted", code: null, title: "残破地图", where: null, note: null },
+    ]);
+  });
+
+  it("returns [] when missing", () => {
+    expect(normalizeForeshadowSug(item([]))).toEqual([]);
+    expect(normalizeForeshadowSug(undefined)).toEqual([]);
+  });
+});
+
+describe("normalizePace", () => {
+  it("tightens dict into PaceReport, filtering bad water/beats", () => {
+    const out = normalizePace({
+      ...item([]),
+      pace: {
+        water: [{ where: "第3段", reason: "注水" }, "junk"],
+        hook: true,
+        beat_map: [1, 3, "x", 5],
+      },
+    });
+    expect(out).toEqual({
+      water: [{ where: "第3段", reason: "注水" }],
+      hook: true,
+      beat_map: [1, 3, 5],
+    });
+  });
+
+  it("returns null when pace is missing or not a dict", () => {
+    expect(normalizePace(item([]))).toBeNull();
+    expect(normalizePace(undefined)).toBeNull();
+  });
+});
+
 describe("latestReview", () => {
   it("returns first item (history is newest-first)", () => {
     const a = item([]);