* fix: tighten list handling and s3 test support * chore: tidy imports and metric updates * Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <[email protected]> Signed-off-by: Zhengchao An <[email protected]> * fix: address s3tests review follow-ups --------- Signed-off-by: Zhengchao An <[email protected]> Co-authored-by: Zhengchao An <[email protected]> Co-authored-by: Copilot Autofix powered by AI <[email protected]>