fix(agent): keep response policy in managed prompt

ai_knowledge_base_v2/apps/backend/tests/test_knowledge_agent.py

@@ -21,7 +21,6 @@ from app.models.knowledge import (
 )
 from app.models.chat import ChatMessage
 from app.services.knowledge_agent_service import Candidate, KnowledgeAgentService
-from app.services.rag_service import PromptService, RetrievedChunk
 
 
 def _database() -> Session:
@@ -146,9 +145,6 @@ def test_course_question_searches_chunk_and_reads_parent_section():
         knowledge_context = next(
             message["content"] for message in result.messages if message["content"].startswith("[本轮可靠知识上下文]")
         )
-        assert "不得再以‘没有资料’" in knowledge_context
-        assert "不要求知识库中必须存在一个" in knowledge_context
-        assert "不要把本轮已经取到的内容留到下一轮再问" in knowledge_context
         assert "来源知识库：亲子课程" in knowledge_context
 
 
@@ -228,26 +224,6 @@ def test_homework_overview_keeps_all_numbered_practices_before_selection():
     assert all(item.chunk.title.startswith("练习") for item in selected)
 
 
-def test_homework_overview_prompt_requires_every_recalled_title():
-    chunks = [
-        RetrievedChunk(
-            knowledge_id=1 if index <= 6 else 2,
-            knowledge_name="《原生·上》" if index <= 6 else "《原生·下》",
-            title=f"练习{index}：作业{index}",
-            content=f"作业{index}的正式说明",
-        )
-        for index in range(1, 15)
-    ]
-
-    constraint = PromptService._list_completeness_constraint("原生里的作业都有哪些", chunks)
-
-    assert "本轮共召回 14 个正式编号练习" in constraint
-    assert "必须覆盖下面全部 14 项" in constraint
-    assert "不得新增清单外的作业" in constraint
-    assert "练习1：作业1" in constraint
-    assert "练习14：作业14" in constraint
-
-
 def test_complete_section_includes_child_headings_but_stops_at_next_peer():
     with _database() as db:
         knowledge = _add_published_knowledge(db, knowledge_id=1, name="合一课程")