Research graph test cassette

CHANGELOG.md

@@ -1,6 +1,14 @@
 # Changelog
 ## [Unreleased]
 
+### Changed
+
+- **BREAKING: Module Reorganization**: Consolidated all agent code under `haiku.rag.agents`
+  - Moved `haiku.rag.qa` → `haiku.rag.agents.qa`
+  - Moved `haiku.rag.graph.research` → `haiku.rag.agents.research`
+  - Added `haiku.rag.agents.chat` module with conversational RAG agent (`create_chat_agent`, `SearchAgent`, `ChatDeps`, `ChatSessionState`)
+  - Deleted `haiku.rag.graph` module (research graph now at `haiku.rag.agents.research.graph`)
+
 ### Removed
 
 - **BREAKING: Custom AG-UI Infrastructure**: Removed custom AG-UI event handling in favor of pydantic-ai's native AG-UI support

tests/agents/research/test_research_graph.py

@@ -1,3 +1,5 @@
+from pathlib import Path
+
 import pytest
 
 from haiku.rag.agents.research.dependencies import ResearchContext
@@ -7,6 +9,13 @@ from haiku.rag.agents.research.state import ResearchDeps, ResearchState
 from haiku.rag.client import HaikuRAG
 
 
+@pytest.fixture(scope="module")
+def vcr_cassette_dir():
+    return str(
+        Path(__file__).parent.parent.parent / "cassettes" / "test_research_graph"
+    )
+
+
 @pytest.mark.vcr()
 async def test_graph_end_to_end(allow_model_requests, temp_db_path, qa_corpus):
     """Test research graph with real LLM calls recorded via VCR."""