- Delete test_minimax_provider.py which imports non-existent `create_llm`
function (should be `create_llm_provider`), causing pytest collection errors
- Add scripts/smoke-test-slim.sh: shared retain + recall validation script
used by both Docker slim and pip slim CI jobs
- Update docker/test-image.sh to run retain/recall after health check for
all API targets
- Update test-pip-slim CI job to run the shared smoke test script
