Bugfix: Only allow rank==0 to clean up old checkpoints (#2558)

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

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열    10
스물    20
서른    30
마흔    40
쉰    50
예순    60
일흔    70
여든    80
아흔    90