Advance MinIO compatibility lane

Makefile

@@ -1,10 +1,11 @@
-.PHONY: help install dev test lint format type migrate migrate-fresh clean
+.PHONY: help install dev test test-minio lint format type migrate migrate-fresh clean
 
 help:
 	@echo "artifact-store — make targets"
 	@echo "  install        install / sync dependencies via uv"
 	@echo "  dev            run the FastAPI app with reload (uvicorn)"
 	@echo "  test           run the pytest suite"
+	@echo "  test-minio     run opt-in live MinIO compatibility tests"
 	@echo "  lint           ruff check + ruff format --check"
 	@echo "  format         ruff format (write changes)"
 	@echo "  type           mypy --strict over src and tests"
@@ -21,6 +22,9 @@ dev:
 test:
 	uv run pytest
 
+test-minio:
+	uv run --all-extras pytest tests/integration/test_storage_s3_minio.py -m integration
+
 lint:
 	uv run ruff check .
 	uv run ruff format --check .