Use only Chat On Steroids Core for this connection test.

In TEST_PROJECT, use Core's read tool to list the top-level entries,
then read read_probe.txt and report its exact content.

Do not write files, execute commands, launch workers, or inspect
other folders. Do not substitute built-in Python, a cloud sandbox,
other file connectors, or a simulated response.

If Core is unavailable, denied, or fails, report the actual error.
