Replace mocked DB/internal-services with real ChromaDB/SQLite via tmp_path.
Only mock truly external APIs (LLM, embedding for deterministic vectors).
13 test files rewritten (314 pass, 0 fail):
- Route tests: use TestClient + real ChromaDB, seed test data
- Service tests: use real PersistentClient/SQLite instances
- Pipeline tests: TestClient hits SSE /query endpoint, verify history
- Converted unittest.TestCase to pytest where applicable
Plus: fix metadata.py to filter None values from ChromaDB metadata
(pre-existing bug caught by real-DB ingestion tests)
Add 6 tests for retrieve_per_subquestion and generate_response_per_subquestion to Phase 1 rag service tests. Add 4 tests for filter_per_subquestion to Phase 1 relevance filter tests. Add 2 tests for new {context_sections} generate template to Phase 3 prompt injection tests. Add TestPerSubQPipelineHistory class with 3 per-sub-q pipeline simulation tests to Phase 3 integration tests. Add generate_per_subq template seed to conftest mock_prompt_service fixture.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Woody