- get_rank/get_world_size fall back to RANK/WORLD_SIZE env instead of hardcoded 0/1, matching torchrun's env-before-init contract - log filter reuses the helpers so initialized groups show real ranks; local-spawn children previously logged rank=0/8
- get_rank/get_world_size fall back to RANK/WORLD_SIZE env instead of hardcoded 0/1, matching torchrun's env-before-init contract - log filter reuses the helpers so initialized groups show real ranks; local-spawn children previously logged rank=0/8