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/components/review/BeatMap.tsx

@@ -0,0 +1,34 @@
+"use client";
+
+import { toBeatCells, toSparkline } from "@/lib/pace/beatmap";
+
+interface BeatMapProps {
+  beatMap: number[];
+}
+
+// 爽点节拍图（UX §6.4）：beat_map(int 序列) → ▁▃▅ 柱状条。
+// 渲染为定高柱（CSS height%），同时给文本 sparkline 作无障碍标签（a11y §10）。
+// 静态高度，无动画 → 天然尊重 prefers-reduced-motion。
+export function BeatMap({ beatMap }: BeatMapProps) {
+  const cells = toBeatCells(beatMap);
+  if (cells.length === 0) {
+    return <span className="text-xs text-ink-soft/60">无节拍数据</span>;
+  }
+  const spark = toSparkline(beatMap);
+  return (
+    <div
+      className="flex h-12 items-end gap-0.5"
+      role="img"
+      aria-label={`爽点节拍图 ${spark}`}
+    >
+      {cells.map((cell, i) => (
+        <div
+          key={i}
+          className="min-w-[4px] flex-1 rounded-t bg-cinnabar/70"
+          style={{ height: `${cell.heightPct}%` }}
+          title={`第${i + 1}拍 强度${cell.value}`}
+        />
+      ))}
+    </div>
+  );
+}

apps/web/components/review/ForeshadowSuggestions.tsx

@@ -0,0 +1,58 @@
+"use client";
+
+import type { ForeshadowSuggestion } from "@/lib/review/sse";
+
+interface ForeshadowSuggestionsProps {
+  suggestions: ForeshadowSuggestion[];
+  // 审项是否未完成（incomplete）。
+  incomplete: boolean;
+}
+
+// 伏笔建议区（UX §6.4 ②）：planted「新埋待确认」/ resolved「疑似回收」，只读建议。
+// 不静默写库（不变量#3）：仅展示，登记/回收经伏笔看板显式确认。
+export function ForeshadowSuggestions({
+  suggestions,
+  incomplete,
+}: ForeshadowSuggestionsProps) {
+  return (
+    <section className="mb-4">
+      <h2 className="text-xs font-semibold uppercase tracking-wide text-ink-soft">
+        伏笔 (foreshadow-analyst)
+      </h2>
+      {incomplete ? (
+        <p className="mt-1 text-xs text-overdue">◌ 未完成</p>
+      ) : suggestions.length === 0 ? (
+        <p className="mt-1 text-xs text-ink-soft">无伏笔建议。</p>
+      ) : (
+        <ul className="mt-2 space-y-2">
+          {suggestions.map((s, i) => (
+            <li
+              key={i}
+              className="rounded border border-line bg-panel p-2 text-xs"
+            >
+              <span
+                className={`mr-1 rounded px-1.5 py-0.5 ${
+                  s.kind === "resolved"
+                    ? "bg-pass/15 text-pass"
+                    : "bg-[var(--color-cinnabar-wash)] text-cinnabar"
+                }`}
+              >
+                {s.kind === "resolved" ? "⚑ 疑似回收" : "＋ 新埋待确认"}
+              </span>
+              {s.code ? (
+                <span className="font-mono text-ink-soft"> {s.code}</span>
+              ) : null}
+              <p className="mt-1 text-ink">{s.title}</p>
+              {s.where ? (
+                <span className="text-ink-soft">{s.where}</span>
+              ) : null}
+              {s.note ? (
+                <p className="mt-0.5 text-ink-soft">{s.note}</p>
+              ) : null}
+            </li>
+          ))}
+        </ul>
+      )}
+    </section>
+  );
+}

apps/web/components/review/PacePanel.tsx

@@ -0,0 +1,56 @@
+"use client";
+
+import type { PaceReport } from "@/lib/review/sse";
+import { BeatMap } from "./BeatMap";
+
+interface PacePanelProps {
+  pace: PaceReport | null;
+  incomplete: boolean;
+}
+
+// 节奏报告区（UX §6.4 ④）：节拍图 ▁▃▅ + 注水段列表 + 章末钩子徽标。只读建议。
+export function PacePanel({ pace, incomplete }: PacePanelProps) {
+  return (
+    <section className="mb-4">
+      <h2 className="text-xs font-semibold uppercase tracking-wide text-ink-soft">
+        节奏 (pace-checker)
+      </h2>
+      {incomplete ? (
+        <p className="mt-1 text-xs text-overdue">◌ 未完成</p>
+      ) : pace === null ? (
+        <p className="mt-1 text-xs text-ink-soft">无节奏报告。</p>
+      ) : (
+        <div className="mt-2 space-y-2 text-xs">
+          <div>
+            <p className="mb-1 text-ink-soft">爽点节拍图</p>
+            <BeatMap beatMap={pace.beat_map} />
+          </div>
+
+          <p>
+            章末钩子：
+            {pace.hook ? (
+              <span className="text-pass">✓ 有</span>
+            ) : (
+              <span className="text-overdue">⚠ 无（建议补悬念）</span>
+            )}
+          </p>
+
+          {pace.water.length > 0 ? (
+            <div>
+              <p className="text-overdue">⚠ 注水段</p>
+              <ul className="mt-1 space-y-1">
+                {pace.water.map((w, i) => (
+                  <li key={i} className="text-ink-soft">
+                    {w.where}：{w.reason}
+                  </li>
+                ))}
+              </ul>
+            </div>
+          ) : (
+            <p className="text-pass">✓ 无明显注水</p>
+          )}
+        </div>
+      )}
+    </section>
+  );
+}

apps/web/components/review/ReviewReport.tsx

@@ -13,13 +13,19 @@ import {
   type DecisionDraft,
   type Verdict,
 } from "@/lib/review/decisions";
-import { normalizeConflicts } from "@/lib/review/history";
+import {
+  normalizeConflicts,
+  normalizeForeshadowSug,
+  normalizePace,
+} from "@/lib/review/history";
 import { useAccept } from "@/lib/review/useAccept";
 import { useReviewStream } from "@/lib/review/useReviewStream";
 import type { ReviewConflict } from "@/lib/review/sse";
 import { AcceptPanel } from "./AcceptPanel";
 import { AnnotatedText } from "./AnnotatedText";
 import { ConflictCard } from "./ConflictCard";
+import { ForeshadowSuggestions } from "./ForeshadowSuggestions";
+import { PacePanel } from "./PacePanel";
 
 interface ReviewReportProps {
   project: ProjectResponse;
@@ -48,19 +54,41 @@ export function ReviewReport({
   const [missing, setMissing] = useState<Set<number>>(new Set());
   const seededRef = useRef(false);
 
-  // 进页一次性把历史 conflicts 种入流状态（无需重审即可裁决）。
+  // 进页一次性把历史留痕（冲突 + 伏笔建议 + 节奏）种入流状态（无需重审即可裁决/查看）。
   const seededConflicts = useMemo(
     () => normalizeConflicts(initialReview),
     [initialReview],
   );
+  const seededForeshadow = useMemo(
+    () => normalizeForeshadowSug(initialReview),
+    [initialReview],
+  );
+  const seededPace = useMemo(
+    () => normalizePace(initialReview),
+    [initialReview],
+  );
   useEffect(() => {
     if (seededRef.current) return;
     seededRef.current = true;
-    if (seededConflicts.length > 0) review.seed(seededConflicts);
-  }, [review, seededConflicts]);
+    const hasSeed =
+      seededConflicts.length > 0 ||
+      seededForeshadow.length > 0 ||
+      seededPace !== null;
+    if (hasSeed) {
+      review.seed({
+        conflicts: seededConflicts,
+        foreshadow: seededForeshadow,
+        pace: seededPace,
+      });
+    }
+  }, [review, seededConflicts, seededForeshadow, seededPace]);
 
   // 当前生效冲突 = 流状态（重审后即时更新，否则种入的历史）。
   const conflicts: ReviewConflict[] = review.state.conflicts;
+  const foreshadow = review.state.foreshadow;
+  const pace = review.state.pace;
+  const sectionStatus = (name: string): string | undefined =>
+    review.state.sections.find((s) => s.name === name)?.status;
 
   // 重审完成（done 边沿）→ 重置裁决草稿对齐新冲突集（冲突可能整组变化）。
   const conflictCount = conflicts.length;
@@ -127,6 +155,8 @@ export function ReviewReport({
     <AppShell
       title={`〈${project.title}〉`}
       subtitle={`第 ${chapterNo} 章 · 审稿报告`}
+      projectId={project.id}
+      activeNav="review"
     >
       <div className="grid h-[calc(100vh-4rem)] grid-cols-1 lg:grid-cols-[1fr_24rem]">
         {/* 左：终稿正文 + 就地标注 */}
@@ -240,6 +270,17 @@ export function ReviewReport({
             )}
           </section>
 
+          <div className="mt-4 border-t border-line pt-4">
+            <ForeshadowSuggestions
+              suggestions={foreshadow}
+              incomplete={sectionStatus("foreshadow") === "incomplete"}
+            />
+            <PacePanel
+              pace={pace}
+              incomplete={sectionStatus("pace") === "incomplete"}
+            />
+          </div>
+
           <section className="mt-4">
             <AcceptPanel
               conflictCount={conflictCount}