Initial working version

tests/conftest.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+import pytest
+
+
+def pytest_collection_modifyitems(config: pytest.Config, items: list[pytest.Item]) -> None:
+    markexpr = (config.option.markexpr or "").strip()
+    if markexpr:
+        return
+
+    skip_live = pytest.mark.skip(
+        reason="Live tests run only via `pytest -m live` or `pytest -m live_create`."
+    )
+    for item in items:
+        if "live" in item.keywords or "live_create" in item.keywords:
+            item.add_marker(skip_live)