chore: T-P-1 工作区收敛——并行会话成果与历史未入库文件整理入库

- 入库历史遗漏源码/测试：router_system 9 模块（agent/executors/inference/knowledge/
  memory/planner/skills/trace）、tests 11 个测试文件、config/knowledge 领域知识
- 入库根目录方案文档（v2/v3/可行性×2）、references 文献（arxiv 14-18/cnki_open/
  参考文献清单）、research 论文素材（routerarena/paper/中文文献 PDF）
- 前端构建产物刷新（新 hash）；webapp 误写文档删除
- gitignore 增补：deepseek-harness、research/_refs、.mimosa/.zcode、网关日志/pid、
  临时调试脚本、tests/e2e/node_modules、AI代理功能开发/prefix
- 基线确认：318 passed

tests/test_domain_groups.py

@@ -0,0 +1,90 @@
+"""两级路由（domain_group）测试：用户指定大领域 → 组内路由模型 → 组内执行。"""
+import pytest
+
+from router_system.router import build_router
+
+
+@pytest.fixture()
+def router():
+    return build_router()
+
+
+@pytest.mark.asyncio
+async def test_explicit_group_tech(router):
+    # 指定 tech 组：跳过 8 领域统一分类器，组内路由识别 code
+    res = await router.route("用 Python 写一个快速排序函数", domain_group="tech")
+    assert res.domain == "code"
+    assert res.domain_group == "tech"
+    assert any("group:tech@explicit" in s for s in res.route)
+
+
+@pytest.mark.asyncio
+async def test_explicit_group_professional(router):
+    res = await router.route("加班费怎么计算", domain_group="professional")
+    assert res.domain == "legal"
+    assert res.domain_group == "professional"
+    assert res.subdomain == "labor"
+
+
+@pytest.mark.asyncio
+async def test_explicit_group_restricts_domain(router):
+    # 在 tech 组内问法律问题：组内分类器只认识 code/math → 低置信走最后处理者
+    res = await router.route("劳动合同违约怎么办", domain_group="tech")
+    assert res.upgraded is True
+    assert "direct_fallback" in res.route
+
+
+@pytest.mark.asyncio
+async def test_auto_group_detection(router):
+    # 不指定 group：统一分类器识别 → 自动映射大领域组
+    res = await router.route("基金定投的收益率怎么计算")
+    assert res.domain == "finance"
+    assert res.domain_group == "professional"
+    assert any("group:professional@auto" in s for s in res.route)
+
+
+@pytest.mark.asyncio
+async def test_auto_group_tech(router):
+    res = await router.route("求 ∫ x^2 dx 从 0 到 1 的定积分")
+    assert res.domain == "math"
+    assert res.domain_group == "tech"
+
+
+@pytest.mark.asyncio
+async def test_invalid_group_raises(router):
+    with pytest.raises(ValueError):
+        await router.route("任意查询", domain_group="不存在的组")
+
+
+@pytest.mark.asyncio
+async def test_group_router_is_smaller(router):
+    # 组内分类器只认识组内领域：体积/匹配范围 ≈ 全量 1/4
+    assert len(router._group_classifiers["tech"].domains) == 2
+    assert len(router._group_classifiers["professional"].domains) == 3
+    assert len(router.classifier.domains) == 8
+    assert len(router.domain_groups) == 4
+
+
+def test_health_shows_groups(router):
+    h = router.health()
+    assert "domain_groups" in h
+    assert "tech" in h["domain_groups"]
+    assert h["domain_groups"]["tech"] == ["code", "math"]
+
+
+@pytest.mark.asyncio
+async def test_group_with_subdomain2(router):
+    res = await router.route("房贷利率是 LPR 加多少", domain_group="professional")
+    assert res.domain == "finance"
+    assert res.subdomain == "loan"
+    assert res.subdomain2 == "loan"
+    assert "⚠" in res.response  # 金融风险免责
+
+
+@pytest.mark.asyncio
+async def test_group_cache_roundtrip(router):
+    q = "加班费怎么计算"
+    r1 = await router.route(q, domain_group="professional")
+    r2 = await router.route(q, domain_group="professional")  # 缓存命中
+    assert r2.cache_hit is True
+    assert r2.domain_group == r1.domain_group == "professional"