fix(ci): stabilize and speed up CI (#5145)

conftest.py

@@ -9,6 +9,17 @@ from collections.abc import Iterator
 
 import certifi
 import pytest
+from loguru import logger
+
+
+@pytest.fixture(autouse=True)
+def _isolate_nanobot_log_activation() -> Iterator[None]:
+    """Keep CLI log settings from leaking into later tests in the same process."""
+    logger.enable("nanobot")
+    try:
+        yield
+    finally:
+        logger.enable("nanobot")
 
 
 @pytest.fixture(scope="session", autouse=True)