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

packages/agents/tests/test_review_specs.py

@@ -0,0 +1,167 @@
+"""T3.3 三审契约测试：foreshadow / pace spec + 输出 schema（C6 扩）。
+
+契约测试——构造符合 schema 的 mock 响应，校验字段、tier、四审只读（writes==[]）。
+不联网、无 DB。
+"""
+
+from __future__ import annotations
+
+import pytest
+from pydantic import ValidationError
+from ww_agents import (
+    AgentSpec,
+    ForeshadowReview,
+    ForeshadowSuggestion,
+    PaceIssue,
+    PaceReview,
+    foreshadow_spec,
+    pace_spec,
+)
+
+# ---- ForeshadowReview schema ----
+
+
+def test_foreshadow_review_parses_mock_response() -> None:
+    # Arrange：模拟网关 instructor 校验后的结构化产出
+    mock = {
+        "planted": [
+            {
+                "code": "FS-MARK",
+                "title": "胸口的胎记",
+                "where": "第 2 段主角沐浴时被瞥见",
+                "note": "暗示皇族血统",
+            }
+        ],
+        "resolved": [
+            {
+                "code": "FS-BIRTH",
+                "title": "身世之谜",
+                "where": "第 9 段老者道破来历",
+                "note": "回收第 1 章埋设",
+            }
+        ],
+    }
+
+    # Act
+    review = ForeshadowReview.model_validate(mock)
+
+    # Assert
+    assert len(review.planted) == 1
+    assert review.planted[0].code == "FS-MARK"
+    assert review.resolved[0].code == "FS-BIRTH"
+    assert review.resolved[0].where == "第 9 段老者道破来历"
+
+
+def test_foreshadow_review_defaults_to_empty_lists() -> None:
+    review = ForeshadowReview()
+    assert review.planted == []
+    assert review.resolved == []
+
+
+def test_foreshadow_suggestion_only_title_required() -> None:
+    sug = ForeshadowSuggestion.model_validate({"title": "新埋的悬念"})
+    assert sug.title == "新埋的悬念"
+    assert sug.code is None
+    assert sug.where is None
+    assert sug.note is None
+
+
+def test_foreshadow_suggestion_requires_title() -> None:
+    with pytest.raises(ValidationError):
+        ForeshadowSuggestion.model_validate({"code": "FS-X"})
+
+
+# ---- PaceReview schema ----
+
+
+def test_pace_review_parses_mock_response() -> None:
+    mock = {
+        "water": [{"where": "第 4–6 段反复描写天气", "reason": "信息密度低、与主线无关"}],
+        "hook": True,
+        "beat_map": [1, 3, 2, 0, 4, 5],
+    }
+
+    review = PaceReview.model_validate(mock)
+
+    assert len(review.water) == 1
+    assert review.water[0].reason == "信息密度低、与主线无关"
+    assert review.hook is True
+    assert review.beat_map == [1, 3, 2, 0, 4, 5]
+
+
+def test_pace_review_defaults() -> None:
+    review = PaceReview()
+    assert review.water == []
+    assert review.hook is False
+    assert review.beat_map == []
+
+
+def test_pace_issue_requires_where_and_reason() -> None:
+    with pytest.raises(ValidationError):
+        PaceIssue.model_validate({"where": "x"})
+
+
+# ---- foreshadow_spec 声明 ----
+
+
+def test_foreshadow_spec_is_analyst_tier() -> None:
+    assert foreshadow_spec.tier == "analyst"
+    assert foreshadow_spec.name == "foreshadow"
+
+
+def test_foreshadow_spec_is_read_only() -> None:
+    # 不变量 #3：四审只读
+    assert foreshadow_spec.writes == []
+
+
+def test_foreshadow_spec_reads_foreshadow() -> None:
+    assert foreshadow_spec.reads == ["foreshadow"]
+
+
+def test_foreshadow_spec_output_schema() -> None:
+    assert foreshadow_spec.output_schema is ForeshadowReview
+
+
+def test_foreshadow_spec_has_nonempty_system_prompt() -> None:
+    assert foreshadow_spec.system_prompt.strip()
+
+
+# ---- pace_spec 声明 ----
+
+
+def test_pace_spec_is_light_tier() -> None:
+    # 不变量 #2：节奏审用轻量档，只声明 tier
+    assert pace_spec.tier == "light"
+    assert pace_spec.name == "pace"
+
+
+def test_pace_spec_is_read_only() -> None:
+    assert pace_spec.writes == []
+
+
+def test_pace_spec_reads_rules() -> None:
+    # genre 模板 DSL 经 rules（genre 级）注入
+    assert pace_spec.reads == ["rules"]
+
+
+def test_pace_spec_output_schema() -> None:
+    assert pace_spec.output_schema is PaceReview
+
+
+def test_pace_spec_has_nonempty_system_prompt() -> None:
+    assert pace_spec.system_prompt.strip()
+
+
+# ---- 共性：immutable + 是 AgentSpec ----
+
+
+def test_review_specs_are_agent_specs() -> None:
+    assert isinstance(foreshadow_spec, AgentSpec)
+    assert isinstance(pace_spec, AgentSpec)
+
+
+def test_review_specs_are_immutable() -> None:
+    with pytest.raises(ValidationError):
+        foreshadow_spec.tier = "writer"
+    with pytest.raises(ValidationError):
+        pace_spec.tier = "writer"