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)

packages/agents/tests/test_specs.py

@@ -0,0 +1,95 @@
+"""T2.1 续审契约测试：ContinuityReview schema + continuity_spec 声明（C6）。
+
+契约测试——构造符合 schema 的 mock 响应，校验 type 枚举约束、conflicts 列表、
+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, Conflict, ContinuityReview, continuity_spec
+
+
+def test_continuity_review_parses_mock_response() -> None:
+    # Arrange：模拟网关 instructor 校验后的结构化产出
+    mock = {
+        "conflicts": [
+            {
+                "type": "性格漂移",
+                "where": "第 3 段，主角忽然示弱",
+                "refs": ["第 1 章人物卡：性格刚烈"],
+                "suggestion": "改为强硬回应，或补内心转折铺垫",
+            },
+            {
+                "type": "时间线倒错",
+                "where": "开篇提到三日后",
+                "refs": ["第 5 章 digest：事件发生在次日"],
+                "suggestion": "统一为次日",
+            },
+        ]
+    }
+
+    # Act
+    review = ContinuityReview.model_validate(mock)
+
+    # Assert
+    assert len(review.conflicts) == 2
+    assert review.conflicts[0].type == "性格漂移"
+    assert review.conflicts[1].refs == ["第 5 章 digest：事件发生在次日"]
+
+
+def test_continuity_review_allows_empty_conflicts() -> None:
+    review = ContinuityReview.model_validate({"conflicts": []})
+    assert review.conflicts == []
+
+
+def test_continuity_review_defaults_to_empty_conflicts() -> None:
+    review = ContinuityReview()
+    assert review.conflicts == []
+
+
+def test_conflict_type_rejects_unknown_value() -> None:
+    with pytest.raises(ValidationError):
+        Conflict.model_validate({"type": "排版错误", "where": "x", "refs": [], "suggestion": "y"})
+
+
+def test_conflict_refs_default_empty() -> None:
+    conflict = Conflict.model_validate(
+        {"type": "设定违例", "where": "战斗场景", "suggestion": "删去违例能力"}
+    )
+    assert conflict.refs == []
+
+
+def test_continuity_spec_is_analyst_tier() -> None:
+    assert continuity_spec.tier == "analyst"
+    assert continuity_spec.name == "continuity"
+
+
+def test_continuity_spec_is_read_only() -> None:
+    # 不变量 #3：四审只读
+    assert continuity_spec.writes == []
+
+
+def test_continuity_spec_declares_expected_reads() -> None:
+    assert continuity_spec.reads == ["chapter_digests", "characters", "world_entities"]
+
+
+def test_continuity_spec_output_schema_is_continuity_review() -> None:
+    assert continuity_spec.output_schema is ContinuityReview
+
+
+def test_continuity_spec_has_nonempty_system_prompt() -> None:
+    assert continuity_spec.system_prompt.strip()
+
+
+def test_agent_spec_is_immutable() -> None:
+    # frozen：加载后不得改动
+    with pytest.raises(ValidationError):
+        continuity_spec.tier = "writer"
+
+
+def test_agent_spec_writer_allows_none_output_schema() -> None:
+    writer = AgentSpec(name="writer", tier="writer", system_prompt="写")
+    assert writer.output_schema is None
+    assert writer.scope == "builtin"