feat: add governed public knowledge retrieval

tests/unit/service/test_knowledge_authority.py

@@ -0,0 +1,61 @@
+import pytest
+
+from app.core.knowledge_contracts import KnowledgeHit, KnowledgeQuery
+from app.service.knowledge_authority import KnowledgeMysqlAuthority
+
+
+class FakeRow:
+    id = 101
+    title = "申购规则"
+    content_text = '{"answer":"工作日确认"}'
+    version = "v2"
+    milvus_collection = "fin_policy_collection"
+
+
+class FakeSession:
+    statement = None
+
+    async def scalars(self, statement):
+        self.statement = statement
+        return [FakeRow()]
+
+
+@pytest.mark.asyncio
+async def test_authority_filters_to_published_active_effective_knowledge() -> None:
+    session = FakeSession()
+    authority = KnowledgeMysqlAuthority(session)
+
+    hits = await authority.filter_published((
+        KnowledgeHit(
+            knowledge_id="101", collection="fin_policy_collection", snippet="摘要", score=0.91,
+        ),
+    ))
+
+    statement = str(session.statement)
+    assert "review_status" in statement
+    assert "status" in statement
+    assert "effective_date" in statement
+    assert "expire_date" in statement
+    assert hits[0].answer == "工作日确认"
+    assert hits[0].version == "v2"
+
+
+@pytest.mark.asyncio
+async def test_authority_keyword_fallback_only_returns_effective_public_knowledge() -> None:
+    session = FakeSession()
+    authority = KnowledgeMysqlAuthority(session)
+
+    hits = await authority.search_keyword(
+        KnowledgeQuery(query="基金 申购确认", intents=("policy_explain",)),
+        ("fin_policy_collection",),
+        5,
+    )
+
+    statement = str(session.statement)
+    assert "milvus_collection" in statement
+    assert "content_text" in statement
+    assert "review_status" in statement
+    assert "effective_date" in statement
+    assert hits[0].knowledge_id == "101"
+    assert hits[0].collection == "fin_policy_collection"
+    assert hits[0].answer == "工作日确认"