trunk/b9f83ac8558c010d8a221c819dac4e2fac7bd980: Fix remaining checkpoint filesystem races flagged in #194614 (#196591)

发生了什么

Follow-up to #194614 . That PR fixed a checkpoint reload race in post-local SGD tests but noted in review ( comment ) that the same bug shapes exist in several other places. This PR fixes those remaining sites. Root cause Three related races, all stemming from sharing a checkpoint through the filesystem across ranks instead of through a collective: Fixed-name collision: a checkpoint path is built from a hardcoded na…

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