Fix asyncio.get_event_loop() deprecation in test helper; use asyncio.run()

Apply ruff format across codebase

Fix tests broken by stage-language scrub and API changes since last CI run

Fix NDCG@10: use global IDCG over all relevant corpus items, not just retrieved

Update and add tests to match restructured codebase; remove poorly-designed tests

Expose cache header observability

Add percentile comment

Replace manual dict construction

Rename citation fields, strengthen test assertions from loose bounds

Add multi-failure test for evidence quality gate

Simplified cold-start, API takes query directly

Add integrity verification to cache thread safety test

Use MagicMock directly as default_factory for simple cases

Harden middleware shutdown handling and security headers

Fix graceful shutdown resource handling

Add mixed evidence handling to explanation prompts

Add query sanitization for injection defense

Add test coverage for shutdown, lifespan, and cache paths

Add partial result indicator and explanation timeout metrics

Expand /recommend/stream test coverage

Test POST /recommend/stream SSE event flow

Add concurrent load testing for SemanticCache

Add RefusalType enum and query sanitization

Add punctuation normalization

Add boundary test for evidence quality gate

Fix TestEstimateTokens assertions

Add input validation and tests for dcg_at_k

Harden eval loader

Harden data loader

Add chunking tests for edge cases and boundaries

Harden CORS defaults (empty by default, explicit whitelist)

Add docker-compose, multi-stage builds, and developer tooling

Fix RAGAS faithfulness scoring (0.64 → 0.82)

Apply ruff formatting

Fix all CI lint and type errors

Initial commit: Sage RAG recommendation system