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Fix Flex-start TPU lease expiry detection - #172
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The 24-hour Flex-start v5e-8 request exposes
tpu.nodeSpec[].node.schedulingConfig.terminationTimestampthrough the alpha queued-resource describe surface, while the stable surface omits it. This caused the launcher to reject a valid ACTIVE lease withNo explicit lease expiry; nothing launched.Switch the queued-resource describe call to
gcloud alphaso the existing lease parser can read the real termination timestamp. No model, optimizer, training, or runtime behavior changes.