fix: filesystem permission check

[Nexisato]

Description

• fix when user attempts to write to a directory requiring root privileges, no error is thrown, yet no metrics appear on the dashboard.

[gemini-code-assist]

Code Review

This pull request improves error handling during directory creation and run initialization. Specifically, safe_mkdir now immediately raises a PermissionError when permissions are insufficient, preventing misleading timeout errors. Additionally, deliver_run_start is updated to capture and include the original error message in its failure response. Unit tests have been added to verify these behaviors. Feedback is provided to use typing.List instead of the built-in list type hint to maintain compatibility with Python versions older than 3.9.

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